Benchmark Almanac

FrontierCode 2.0

Claude Fable 5.2 50.2% leads since November 2026
Claude Fable 5.2 50.2% leads since November 2026
In use

Agents resolve 132 maintainer-built tasks from deliberately ambiguous prompts. Rubric checks ask whether a maintainer would merge the change.

Draws on 55% more repositories than 1.1 and has 501 blocking checks for thoroughness, against 168 in 1.1.

Made by
Cognition
Released
October 2026
Kind
Fixing real repositories
Level
Expert
Scored
Checked automatically
Answers
Code
Tasks
Kept private
Strongest model tested
Claude Fable 5.2 #1 on the capability index
Last in a launch post
November 2026
Last model added
November 2026
Scores refreshed
November 13th, 2026
32
Models scored on its own leaderboard
6
Launch posts list it, from 6 labs
2
System cards report it, from 2 labs

Claude Fable 5.2 leads with 50.2%

Best score per model from the benchmark's own leaderboard, read on November 13th, 2026. Where a model ran with several settings or harnesses, we keep its best. Every run is in the next chart.

Claude Fable 5.2 leads with 50.2%, claims included

Best score per model from every source, including labs’ own numbers and claims Epoch AI collected from reports and papers. Labs pick their own settings, so a claim can beat an independent run of the same model.

32 models. Scroll sideways for the rest.

  1. 50.2 Claude Fable 5.2
  2. 47.3 Claude Opus 5.5
  3. 44.0 GPT-6 Astra
  4. 42.6 Gemini 4 Carbon
  5. 42.2 Claude Sonnet 5.5
  6. 39.6 GPT-6.1 Sol
  7. 38.9 Gemini 4 Hydrogen
  8. 34.9 GPT-6 Sol
  9. 34.0 Claude Fable 5.1
  10. 28.9 Claude Haiku 5.5
  11. 28.9 Grok 4.7
  12. 28.9 GPT-5.6 Sol
  13. 28.1 Claude Opus 5
  14. 27.6 Gemini 4 Argon
  15. 25.3 Muse Wonder
  16. 24.1 SWE-2
  17. 24.0 SWE-2 Flash
  18. 23.6 GPT-5.5
  19. 22.7 GPT-6 Luna
  20. 22.6 Inkling 2 Small
  21. 20.2 DeepSeek V4.1 Flash 1017
  22. 20.1 GLM-5.3
  23. 19.9 Kimi K3.1 Pro
  24. 19.6 Mistral Large 4
  25. 18.9 Kimi K3
  26. 15.5 SWE-1.7
  27. 15.3 Claude Opus 4.8
  28. 14.9 GLM-5.3-Flash
  29. 6.46 Muse Spark Open
  30. 3.96 Inkling-Small
  31. 3.41 Beam 1.0
  32. 1.34 SWE-1.6
  1. 1 Claude Fable 5.2 xhigh 50.2%
  2. 2 Claude Opus 5.5 max 47.3%
  3. 3 GPT-6 Astra max 44%
  4. 4 Gemini 4 Carbon high 42.6%
  5. 5 Claude Sonnet 5.5 max 42.2%
  6. 6 GPT-6.1 Sol max 39.6%
  7. 7 Gemini 4 Hydrogen xhigh 38.9%
  8. 8 GPT-6 Sol max 34.9%
  9. 9 Claude Fable 5.1 xhigh 34%
  10. 10 Claude Haiku 5.5 max 28.9%
  11. 11 Grok 4.7 xhigh 28.9%
  12. 12 GPT-5.6 Sol max 28.9%
  13. 13 Claude Opus 5 high 28.1%
  14. 14 Gemini 4 Argon high 27.6%
  15. 15 Muse Wonder xhigh 25.3%
  16. 16 SWE-2 high 24.1%
  17. 17 SWE-2 Flash max 24%
  18. 18 GPT-5.5 xhigh 23.6%
  19. 19 GPT-6 Luna max 22.7%
  20. 20 Inkling 2 Small max 22.6%
  21. 21 DeepSeek V4.1 Flash 1017 max 20.2%
  22. 22 GLM-5.3 max 20.1%
  23. 23 Kimi K3.1 Pro max 19.9%
  24. 24 Mistral Large 4 high 19.6%
  25. 25 Kimi K3 high 18.9%
  26. 26 SWE-1.7 na 15.5%
  27. 27 Claude Opus 4.8 max 15.3%
  28. 28 GLM-5.3-Flash max 14.9%
  29. 29 Muse Spark Open xhigh 6.46%
  30. 30 Inkling-Small max 3.96%
  31. 31 Beam 1.0 max 3.41%
  32. 32 SWE-1.6 na 1.34%

Source: Official FrontierCode 2.0 leaderboard

35 models. Scroll sideways for the rest.

  1. 50.2 Claude Fable 5.2
  2. 47.3 Claude Opus 5.5
  3. 44.0 GPT-6 Astra
  4. 42.6 Gemini 4 Carbon
  5. 42.2 Claude Sonnet 5.5
  6. 39.6 GPT-6.1 Sol
  7. 38.9 Gemini 4 Hydrogen
  8. 34.9 GPT-6 Sol
  9. 34.0 Claude Fable 5.1
  10. 31.0 Tencent Hy4
  11. 28.9 Claude Haiku 5.5
  12. 28.9 Grok 4.7
  13. 28.9 GPT-5.6 Sol
  14. 28.1 Claude Opus 5
  15. 27.6 Gemini 4 Argon
  16. 27.2 Muse Ember
  17. 25.4 Inkling 2 Small
  18. 25.3 Muse Wonder
  19. 24.1 SWE-2
  20. 24.0 SWE-2 Flash
  21. 23.6 GPT-5.5
  22. 22.7 GPT-6 Luna
  23. 20.2 DeepSeek V4.1 Flash 1017
  24. 20.1 GLM-5.3
  25. 19.9 Kimi K3.1 Pro
  26. 19.7 Mistral Large 4 (Le Chonk, open weights)
  27. 19.6 Mistral Large 4
  28. 18.9 Kimi K3
  29. 15.5 SWE-1.7
  30. 15.3 Claude Opus 4.8
  31. 14.9 GLM-5.3-Flash
  32. 6.46 Muse Spark Open
  33. 3.96 Inkling-Small
  34. 3.41 Beam 1.0
  35. 1.34 SWE-1.6
  1. 1 Claude Fable 5.2 xhigh 50.2%
  2. 2 Claude Opus 5.5 max 47.3%
  3. 3 GPT-6 Astra max 44%
  4. 4 Gemini 4 Carbon high 42.6%
  5. 5 Claude Sonnet 5.5 max 42.2%
  6. 6 GPT-6.1 Sol max 39.6%
  7. 7 Gemini 4 Hydrogen xhigh 38.9%
  8. 8 GPT-6 Sol max 34.9%
  9. 9 Claude Fable 5.1 xhigh 34%
  10. 10 Tencent Hy4 31%
  11. 11 Claude Haiku 5.5 max 28.9%
  12. 12 Grok 4.7 xhigh 28.9%
  13. 13 GPT-5.6 Sol max 28.9%
  14. 14 Claude Opus 5 high 28.1%
  15. 15 Gemini 4 Argon high 27.6%
  16. 16 Muse Ember 27.2%
  17. 17 Inkling 2 Small 25.4%
  18. 18 Muse Wonder xhigh 25.3%
  19. 19 SWE-2 high 24.1%
  20. 20 SWE-2 Flash max 24%
  21. 21 GPT-5.5 xhigh 23.6%
  22. 22 GPT-6 Luna max 22.7%
  23. 23 DeepSeek V4.1 Flash 1017 max 20.2%
  24. 24 GLM-5.3 max 20.1%
  25. 25 Kimi K3.1 Pro max 19.9%
  26. 26 Mistral Large 4 (Le Chonk, open weights) 19.7%
  27. 27 Mistral Large 4 high 19.6%
  28. 28 Kimi K3 high 18.9%
  29. 29 SWE-1.7 na 15.5%
  30. 30 Claude Opus 4.8 max 15.3%
  31. 31 GLM-5.3-Flash max 14.9%
  32. 32 Muse Spark Open xhigh 6.46%
  33. 33 Inkling-Small max 3.96%
  34. 34 Beam 1.0 max 3.41%
  35. 35 SWE-1.6 na 1.34%

Sources: Official FrontierCode 2.0 leaderboard and labs’ model cards

#ModelScoreSettingDateSource
1 Claude Fable 5.2 50.2% xhigh, Claude Code Nov 2026 Official leaderboard
2 Claude Opus 5.5 47.3% max, Claude Code Sep 2026 Official leaderboard
3 GPT-6 Astra 44% max, Codex Sep 2026 Official leaderboard
4 Gemini 4 Carbon 42.6% high, antigravity-cli Oct 2026 Official leaderboard
5 Claude Sonnet 5.5 42.2% max, Claude Code Sep 2026 Official leaderboard
6 GPT-6.1 Sol 39.6% max, Codex Sep 2026 Official leaderboard
7 Gemini 4 Hydrogen 38.9% xhigh, antigravity-cli Nov 2026 Official leaderboard
8 GPT-6 Sol 34.9% max, Codex Sep 2026 Official leaderboard
9 Claude Fable 5.1 34% xhigh, Claude Code Sep 2026 Official leaderboard
10 Claude Haiku 5.5 28.9% max, Claude Code Oct 2026 Official leaderboard
11 Grok 4.7 28.9% xhigh, Grok Build Sep 2026 Official leaderboard
12 GPT-5.6 Sol 28.9% max, Codex Jul 2026 Official leaderboard
13 Claude Opus 5 28.1% high, Claude Code Jul 2026 Official leaderboard
14 Gemini 4 Argon 27.6% high, Devin CLI Sep 2026 Official leaderboard
15 Muse Wonder 25.3% xhigh, Muse Code Oct 2026 Official leaderboard
16 SWE-2 24.1% high, Devin Sep 2026 Official leaderboard
17 SWE-2 Flash 24% max, Devin Nov 2026 Official leaderboard
18 GPT-5.5 23.6% xhigh, Codex Apr 2026 Official leaderboard
19 GPT-6 Luna 22.7% max, Codex Sep 2026 Official leaderboard
20 Inkling 2 Small 22.6% max, Devin CLI Nov 2026 Official leaderboard
21 DeepSeek V4.1 Flash 1017 20.2% max, Devin CLI Oct 2026 Official leaderboard
22 GLM-5.3 20.1% max, Devin CLI Aug 2026 Official leaderboard
23 Kimi K3.1 Pro 19.9% max, Devin CLI Oct 2026 Official leaderboard
24 Mistral Large 4 19.6% high, Mistral Vibe Oct 2026 Official leaderboard
25 Kimi K3 18.9% high, Devin CLI Jul 2026 Official leaderboard
26 SWE-1.7 15.5% na, Devin CLI Jul 2026 Official leaderboard
27 Claude Opus 4.8 15.3% max, Claude Code May 2026 Official leaderboard
28 GLM-5.3-Flash 14.9% max, Devin CLI Aug 2026 Official leaderboard
29 Muse Spark Open 6.46% xhigh, Devin CLI Oct 2026 Official leaderboard
30 Inkling-Small 3.96% max, Devin CLI Jul 2026 Official leaderboard
31 Beam 1.0 3.41% max, Devin CLI Oct 2026 Official leaderboard
32 SWE-1.6 1.34% na, Devin CLI Apr 2026 Official leaderboard
#ModelScoreSettingDateSource
1 Claude Fable 5.2 50.2% xhigh, Claude Code Nov 2026 Official leaderboard
2 Claude Opus 5.5 47.3% max, Claude Code Sep 2026 Official leaderboard
3 GPT-6 Astra 44% max, Codex Sep 2026 Official leaderboard
4 Gemini 4 Carbon 42.6% high, antigravity-cli Oct 2026 Official leaderboard
5 Claude Sonnet 5.5 42.2% max, Claude Code Sep 2026 Official leaderboard
6 GPT-6.1 Sol 39.6% max, Codex Sep 2026 Official leaderboard
7 Gemini 4 Hydrogen 38.9% xhigh, antigravity-cli Nov 2026 Official leaderboard
8 GPT-6 Sol 34.9% max, Codex Sep 2026 Official leaderboard
9 Claude Fable 5.1 34% xhigh, Claude Code Sep 2026 Official leaderboard
10 Tencent Hy4 31% Nov 2026 Lab model card
11 Claude Haiku 5.5 28.9% max, Claude Code Oct 2026 Official leaderboard
12 Grok 4.7 28.9% xhigh, Grok Build Sep 2026 Official leaderboard
13 GPT-5.6 Sol 28.9% max, Codex Jul 2026 Official leaderboard
14 Claude Opus 5 28.1% high, Claude Code Jul 2026 Official leaderboard
15 Gemini 4 Argon 27.6% high, Devin CLI Sep 2026 Official leaderboard
16 Muse Ember 27.2% Nov 2026 Lab model card
17 Inkling 2 Small 25.4% Nov 2026 Lab model card
18 Muse Wonder 25.3% xhigh, Muse Code Oct 2026 Official leaderboard
19 SWE-2 24.1% high, Devin Sep 2026 Official leaderboard
20 SWE-2 Flash 24% max, Devin Nov 2026 Official leaderboard
21 GPT-5.5 23.6% xhigh, Codex Apr 2026 Official leaderboard
22 GPT-6 Luna 22.7% max, Codex Sep 2026 Official leaderboard
23 DeepSeek V4.1 Flash 1017 20.2% max, Devin CLI Oct 2026 Official leaderboard
24 GLM-5.3 20.1% max, Devin CLI Aug 2026 Official leaderboard
25 Kimi K3.1 Pro 19.9% max, Devin CLI Oct 2026 Official leaderboard
26 Mistral Large 4 (Le Chonk, open weights) 19.7% Oct 2026 Lab model card
27 Mistral Large 4 19.6% high, Mistral Vibe Oct 2026 Official leaderboard
28 Kimi K3 18.9% high, Devin CLI Jul 2026 Official leaderboard
29 SWE-1.7 15.5% na, Devin CLI Jul 2026 Official leaderboard
30 Claude Opus 4.8 15.3% max, Claude Code May 2026 Official leaderboard
31 GLM-5.3-Flash 14.9% max, Devin CLI Aug 2026 Official leaderboard
32 Muse Spark Open 6.46% xhigh, Devin CLI Oct 2026 Official leaderboard
33 Inkling-Small 3.96% max, Devin CLI Jul 2026 Official leaderboard
34 Beam 1.0 3.41% max, Devin CLI Oct 2026 Official leaderboard
35 SWE-1.6 1.34% na, Devin CLI Apr 2026 Official leaderboard

Labs report scores for 6 models in their cards. Switch the scores above to rank them together.

The best score, 50.2%, costs $18 a task

Runs on the cost frontier score higher than any run that's cheaper. Claude Fable 5.2 at high comes within 3.9 points of the best for $8.40 a task, about half the cost. The costs are the leaderboard's own estimates, so compare them only within this benchmark.

OpenAI Anthropic Google DeepMind Cognition Cost frontier One model at each effort level
0% 20% 40% 60% $0.01 $0.10 $1.00 $10 $100 Cost per task, log scale Claude Fable 5.2, xhigh Claude Opus 5.5, max Claude Opus 5.5, xhigh GPT-6 Astra, xhigh GPT-6.1 Sol, max GPT-6.1 Sol, high GPT-6.1 Sol, medium 0% 20% 40% 60% $0.01 $0.10 $1.00 $10 $100 Cost per task, log scale Claude Fable 5.2, xhigh Claude Fable 5.2, high

Source: Official FrontierCode 2.0 leaderboard

ModelEffortHarnessScoreCost per taskOutput tokens
Claude Fable 5.2 xhigh Claude Code 50.2% $18 156,009
Claude Fable 5.2 max Claude Code 48.2% $56 417,808
Claude Opus 5.5 max Claude Code 47.3% $13 201,919
Claude Fable 5.2 high Claude Code 46.2% $8.40 75,978
Claude Opus 5.5 xhigh Claude Code 44.7% $5.18 88,053
GPT-6 Astra max Codex 44% $6.68 36,354
Gemini 4 Carbon high antigravity-cli 42.6% $5.06 127,641
Claude Sonnet 5.5 max Claude Code 42.2% $20 514,722
GPT-6 Astra xhigh Codex 41.7% $4.54 20,869
Gemini 4 Carbon medium antigravity-cli 40.9% $4.49 114,385
GPT-6.1 Sol max Codex 39.6% $1.03 41,479
Gemini 4 Hydrogen xhigh antigravity-cli 38.9% $4.95 153,739
GPT-6 Astra high Codex 38.8% $4.28 18,433
Claude Fable 5.2 medium Claude Code 38.8% $3.10 28,384
Gemini 4 Hydrogen high antigravity-cli 38.2% $2.40 85,996
GPT-6 Astra medium Codex 37.3% $3.49 14,065
Claude Sonnet 5.5 xhigh Claude Code 36.5% $3.31 80,433
Claude Opus 5.5 high Claude Code 36.3% $2.42 41,233
Claude Fable 5.2 low Claude Code 35.3% $2.62 23,907
GPT-6.1 Sol high Codex 35.1% $0.65 22,419
GPT-6 Sol max Codex 34.9% $2.35 54,181
Claude Fable 5.1 xhigh Claude Code 34% $8.68 92,813
GPT-6.1 Sol xhigh Codex 33% $0.69 24,789
Claude Fable 5.1 max Claude Code 33% $11 119,089
Gemini 4 Carbon low antigravity-cli 31.5% $7.72 51,553
Claude Opus 5.5 medium Claude Code 31.4% $1.70 30,068
GPT-6 Astra low Codex 31.1% $2.44 8,987
GPT-6 Sol xhigh Codex 30.4% $1.44 28,587
GPT-6.1 Sol medium Codex 30.3% $0.49 15,686
Claude Haiku 5.5 max Claude Code 28.9% $0.37 205,112
Grok 4.7 xhigh Grok Build 28.9% $14 110,790
GPT-5.6 Sol max Codex 28.9% $5.50 38,352
Gemini 4 Hydrogen medium antigravity-cli 28.2% $0.90 37,841
Claude Opus 5 high Claude Code 28.1% $8.36 59,260
Gemini 4 Argon high Devin CLI 27.6% $6.51 148,569
Claude Opus 5 xhigh Claude Code 27.4% $11 76,436
Claude Opus 5 max Claude Code 27.2% $13 88,196
Claude Fable 5.1 high Claude Code 26.6% $5.39 54,242
Grok 4.7 high Grok Build 26.5% $11 94,341
Grok 4.7 medium Grok Build 26.1% $8.03 72,180
GPT-6.1 Sol low Codex 25.7% $0.34 10,042
Muse Wonder xhigh Muse Code 25.3% $3.79 38,672
GPT-5.6 Sol xhigh Codex 25% $3.83 26,415
Muse Wonder high Muse Code 24.9% $3.14 32,832
GPT-5.6 Sol high Codex 24.9% $3.17 20,920
Claude Opus 5 medium Claude Code 24.6% $5.22 39,813
Gemini 4 Argon medium Devin CLI 24.4% $5.69 123,879
SWE-2 high Devin 24.1% $0.96 68,546
SWE-2 Flash max Devin 24% $0.20 91,090
SWE-2 max Devin 24% $1.26 97,584
Muse Wonder medium Muse Code 23.9% $2.53 26,714
GPT-5.5 xhigh Codex 23.6% $5.28 30,925
GPT-6 Sol high Codex 23.3% $1.07 19,393
SWE-2 Flash low Devin 23.2% $0.20 95,841
Claude Sonnet 5.5 high Claude Code 22.9% $1.07 27,839
Claude Haiku 5.5 xhigh Claude Code 22.9% $0.23 127,735
GPT-6 Luna max Codex 22.7% $0.17 79,659
Inkling 2 Small max Devin CLI 22.6% $0.58 95,400
Gemini 4 Argon low Devin CLI 22.4% $3.98 63,291
Inkling 2 Small high Devin CLI 22.3% $0.56 89,707
Claude Fable 5.1 medium Claude Code 22.3% $3.89 37,911
GPT-6 Sol medium Codex 22.1% $0.82 13,750
Muse Wonder low Muse Code 21.6% $1.84 20,301
Claude Fable 5.1 low Claude Code 21.2% $3.01 28,797
Grok 4.7 low Grok Build 21.1% $3.87 38,161
Inkling 2 Small xhigh Devin CLI 20.7% $0.61 100,243
DeepSeek V4.1 Flash 1017 max Devin CLI 20.2% $0.38 82,220
GLM-5.3 max Devin CLI 20.1% $7.52 100,706
GPT-5.6 Sol medium Codex 20% $2.36 15,446
Kimi K3.1 Pro max Devin CLI 19.9% $3.03 37,242
DeepSeek V4.1 Flash 1017 high Devin CLI 19.8% $0.27 57,169
GPT-5.5 high Codex 19.7% $3.80 21,907
Mistral Large 4 high Mistral Vibe 19.6% $1.55 88,069
Claude Opus 5 low Claude Code 19.3% $3.28 26,898
Claude Haiku 5.5 high Claude Code 19.3% $0.14 80,993
Inkling 2 Small medium Devin CLI 19.1% $0.42 59,165
Kimi K3 high Devin CLI 18.9% $4.47 49,854
GPT-6 Luna xhigh Codex 18.4% $0.13 50,565
Kimi K3 max Devin CLI 18.4% $5.46 64,271
GLM-5.3 high Devin CLI 18% $5.18 73,247
Kimi K3.1 Pro high Devin CLI 17.5% $2.36 27,628
Inkling 2 Small none Devin CLI 17.4% $0.44 62,628
DeepSeek V4.1 Flash 1017 low Devin CLI 17.3% $0.21 40,659
GPT-6 Luna high Codex 16.5% $0.12 42,170
SWE-2 medium Devin 16.2% $0.44 28,705
GPT-6 Luna medium Codex 16.1% $0.09 31,360
Inkling 2 Small low Devin CLI 15.6% $0.29 36,894
SWE-1.7 na Devin CLI 15.5% $3.52 89,251
Claude Opus 4.8 max Claude Code 15.3% $12 125,863
Claude Sonnet 5.5 medium Claude Code 15% $0.48 14,449
GLM-5.3-Flash max Devin CLI 14.9% $0.79 90,044
Claude Opus 4.8 xhigh Claude Code 14.9% $9.13 88,364
Claude Opus 5.5 low Claude Code 14.8% $0.75 14,230
GPT-5.5 medium Codex 14.7% $2.95 16,320
GLM-5.3 low Devin CLI 14.4% $3.19 47,199
Claude Haiku 5.5 medium Claude Code 14.1% $0.10 57,582
GPT-5.6 Sol low Codex 12.9% $1.45 9,806
GLM-5.3-Flash high Devin CLI 12.9% $0.58 56,914
Kimi K3.1 Pro low Devin CLI 12.9% $1.88 20,367
Kimi K3 low Devin CLI 11.3% $2.98 28,740
Claude Opus 4.8 medium Claude Code 11.3% $5.59 57,192
Claude Opus 4.8 high Claude Code 11.1% $6.32 62,298
Claude Haiku 5.5 low Claude Code 10.6% $0.07 39,366
Gemini 4 Hydrogen low antigravity-cli 10.5% $0.35 14,953
GPT-6 Sol low Codex 10.5% $0.42 6,487
Claude Opus 4.8 low Claude Code 9.79% $4.20 40,687
Claude Sonnet 5.5 low Claude Code 9.66% $0.37 11,265
Mistral Large 4 low Mistral Vibe 9.50% $0.67 28,384
Mistral Large 4 medium Mistral Vibe 8.78% $1.03 51,238
GLM-5.3-Flash low Devin CLI 8.01% $0.43 35,321
GPT-5.5 low Codex 7.32% $1.98 10,332
Muse Spark Open xhigh Devin CLI 6.46% $9.16 44,615
Muse Spark Open high Devin CLI 4.15% $6.78 33,810
GPT-6 Luna low Codex 4.05% $0.02 6,519
Inkling-Small max Devin CLI 3.96% $3.68 39,077
Beam 1.0 max Devin CLI 3.41% $1.30 27,971
Beam 1.0 xhigh Devin CLI 2.69% $1.13 23,156
Beam 1.0 high Devin CLI 1.99% $0.61 14,068
Inkling-Small high Devin CLI 1.78% $1.37 13,658
Muse Spark Open medium Devin CLI 1.63% $1.86 11,576
SWE-1.6 na Devin CLI 1.34% $1.36 23,990
Beam 1.0 medium Devin CLI 0.83% $0.32 7,243
Muse Spark Open low Devin CLI 0.42% $0.59 4,472
Beam 1.0 minimal Devin CLI 0% $0.06 1,550
Beam 1.0 low Devin CLI 0% $0.14 3,490

2 models have held number one on the official leaderboard since its release in October 2026 2 models have held number one with claims included since its release in October 2026

Lab claims count from the day the card came out, independent runs from the model’s release. We draw one row each for the benchmark’s own leaderboard and what labs claim in their cards.

Anthropic Mistral AI Tencent
Own leaderboard 2 leaders
Claude Fable 5.2 50.2%
Lab claims 3 leaders
Claude Fable 5.2 49.1%

Sources: Official FrontierCode 2.0 leaderboard and labs’ model cards

Scores over time

All the scores we have, one dot each, so a model tested at several settings appears more than once.

On the benchmark’s own leaderboard Reported by the lab in its model card Best so far
0% 20% 40% 60% 80% 100% 2026 2027 Near the ceiling (85%) Claude Fable 5.2 GPT-6 Astra Claude Fable 5.1 GPT-5.6 Sol GPT-5.5 SWE-1.6 0% 20% 40% 60% 80% 100% 2026 2027 Near the ceiling (85%) Claude Fable 5.2 Claude Fable 5.1

Sources: Official FrontierCode 2.0 leaderboard and labs’ model cards

6 labs put it in a launch post in the last six months

Launch posts from every lab that has listed it, one tick per post. Tall colored ticks include it, and short gray ones leave it out.

Mistral AI
Cognition
Tencent
Thinking Machines
Anthropic
Meta
DateLaunch postScoreAs the post writes it
Nov 9, 2026 Muse Ember 27.2 FrontierCode 2.0-AA, Muse Ember max reasoning
Nov 9, 2026 Claude Fable 5.2 49.1 Agentic coding FrontierCode 2.0, Xhigh effort, best effort score (launch table and Table 8.1.A)
Nov 5, 2026 Inkling 2 Small 25.4 FrontierCode v2.0
Nov 4, 2026 Tencent Hy4 31 FrontierCode 2.0*
Nov 4, 2026 SWE-2 Flash 24 FrontierCode 2.0
Oct 29, 2026 Mistral Large 4 (Le Chonk, open weights) 19.7 Cognition FrontierCode 2.0

2 system cards report it, from 2 labs

Besides launch posts, we read the system cards, model cards and technical reports labs publish with a release. They report far more, including safety and frontier-risk tests.

DateDocumentScoreAs the document writes itSection
Nov 9, 2026 Muse Ember technical report 27.2 FrontierCode 2.0-AA, Muse Ember max reasoning Capabilities
Nov 9, 2026 Claude Fable 5.2 system card 49.1 FrontierCode 2.0, mean@5, Xhigh effort, headline best-performing effort. Max effort 45.7%, or 44.4% if timed-out attempts score zero. High effort 45.3% (Table 8.1.A and Section 8.4) Capabilities

The lab's number comes out ahead in 1 of 2 pairs that differ

Each score a lab reported for its own model, beside the same model's best score on the leaderboard. Gaps mostly come from different harnesses, effort levels and task subsets. 1 of them match, which usually means one side copied the other. Every benchmark.

Model Lab says Board says Gap
Inkling 2 Small 25.4% FrontierCode v2.0 22.6% Leaderboard, max, Devin CLI +2.8 pts
Claude Fable 5.2 49.1% Agentic coding FrontierCode 2.0, Xhigh effort, best effort score (launch table and Table 8.1.A) 50.2% Leaderboard, xhigh, Claude Code −1.1 pts
SWE-2 Flash 24% FrontierCode 2.0 24% Leaderboard, max, Devin Same

Versions

We switch the top row to each new version when it comes out. Open it for one row per version. An old version stays in play while people still test it, so whoever first takes it past 85% gets credit for closing it out.

Anthropic
FrontierCode 2.0 4 leaders
Claude Fable 5.2 50.2%
FrontierCode Replaced by 1.1, Jul 2026
Claude Opus 4.8 34.3%
FrontierCode 1.1 Replaced by 2.0, Oct 2026
Claude Fable 5 53.5%
FrontierCode 2.0 2 leaders
Claude Fable 5.2 50.2%

Source: Official leaderboards

Replaces FrontierCode 1.1

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