Benchmark Almanac

SWE-bench Multimodal

Claude Fable 5.2 74.1% leads since November 2026
o3 36% leads since April 2025
Claude Fable 5.2 74.1% leads since November 2026
In use

SWE-bench tasks whose issues include screenshots or design mockups from visual JavaScript repos. Patch graded by hidden tests.

Released
October 2024
Kind
Fixing real repositories
Level
Expert
Scored
Checked automatically
Answers
Code
Tasks
Public, plus a private test set
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 12th, 2026

In the authors’ words

Autonomous systems for software engineering are now capable of fixing bugs and developing features. These systems are commonly evaluated on SWE-bench (Jimenez et al., 2024a), which assesses their ability to solve software issues from GitHub repositories. However, SWE-bench uses only Python repositories, with problem statements presented predominantly as text and lacking visual elements such as images. This limited coverage motivates our inquiry into how existing systems might perform on unrepresented software engineering domains (e.g., front-end, game development, DevOps), which use different programming languages and paradigms. Therefore, we propose SWE-bench Multimodal (SWE-bench M), to evaluate systems on their ability to fix bugs in visual, user-facing JavaScript software. SWE-bench M features 617 task instances collected from 17 JavaScript libraries used for web interface design, diagramming, data visualization, syntax highlighting, and interactive mapping. Each SWE-bench M task instance contains at least one image in its problem statement or unit tests. Our analysis finds that top-performing SWE-bench systems struggle with SWE-bench M, revealing limitations in visual problem-solving and cross-language generalization. Lastly, we show that SWE-agent's flexible language-agnostic features enable it to substantially outperform alternatives on SWE-bench M, resolving 12% of task instances compared to 6% for the next best system.

Abstract of SWE-bench Multimodal: Do AI Systems Generalize to Visual Software Domains? (arXiv:2410.03859, CC0)
12
Models scored in lab cards
11
Launch posts list it, from 3 labs
10
System cards report it, from 1 lab

Claude Fable 5.2 leads with 74.1%

Best score per model as labs report them in their own cards. Labs pick their own settings, so these compare less cleanly than independent runs.

o3 leads with 36% across all independent runs

Best score per model across the official leaderboard, Epoch AI’s own runs and any board Epoch AI copied. Each bar and row names its source.

Claude Fable 5.2 leads with 74.1%, 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.

  1. 1 Claude Fable 5.2 74.1%
  2. 2 Claude Opus 5.5 61.4%
  3. 3 Claude Opus 5 59.4%
  4. 4 Claude Mythos Preview 59%
  5. 5 Claude Fable 5.1 54.7%
  6. 6 Claude Sonnet 5.5 54.3%
  7. 7 Inkling 2 Small 43.1%
  8. 8 Qwen 3.8 27B 38.6%
  9. 9 Claude Opus 4.8 38.4%
  10. 10 Claude Opus 4.7 34.5%
  11. 11 Claude Haiku 5.5 30.7%
  12. 12 Claude Sonnet 5 28.1%

Source: Labs’ model cards

#ModelScoreSettingDateSource
1 Claude Fable 5.2 74.1% Nov 2026 Lab model card
2 Claude Opus 5.5 61.4% Sep 2026 Lab model card
3 Claude Opus 5 59.4% Jul 2026 Lab model card
4 Claude Mythos Preview 59% Apr 2026 Lab model card
5 Claude Fable 5.1 54.7% Sep 2026 Lab model card
6 Claude Sonnet 5.5 54.3% Sep 2026 Lab model card
7 Inkling 2 Small 43.1% Nov 2026 Lab model card
8 Qwen 3.8 27B 38.6% Aug 2026 Lab model card
9 Claude Opus 4.8 38.4% May 2026 Lab model card
10 Claude Opus 4.7 34.5% Apr 2026 Lab model card
11 Claude Haiku 5.5 30.7% Oct 2026 Lab model card
12 Claude Sonnet 5 28.1% Jun 2026 Lab model card
#ModelScoreSettingDateSource
1 o3 36% GUIRepair Apr 2025 Official leaderboard
2 Claude Sonnet 4 35.6% Refact.ai Agent May 2025 Official leaderboard
3 o4-mini 33.9% GUIRepair Apr 2025 Official leaderboard
4 Claude 3.7 Sonnet 31.3% OpenHands-Versa Feb 2025 Official leaderboard
5 GPT-4.1 31.1% GUIRepair Apr 2025 Official leaderboard
6 GPT-4o Mar 2025 30.4% GUIRepair Mar 2025 Official leaderboard
7 Claude 3.5 Sonnet (October 2024) 25.3% Agentless Lite Oct 2024 Official leaderboard
8 Claude 3.5 Sonnet 12.2% SWE-agent Jun 2024 Official leaderboard
9 GPT-4o Aug 2024 12.2% SWE-agent Multimodal Aug 2024 Official leaderboard
#ModelScoreSettingDateSource
1 Claude Fable 5.2 74.1% Nov 2026 Lab model card
2 Claude Opus 5.5 61.4% Sep 2026 Lab model card
3 Claude Opus 5 59.4% Jul 2026 Lab model card
4 Claude Mythos Preview 59% Apr 2026 Lab model card
5 Claude Fable 5.1 54.7% Sep 2026 Lab model card
6 Claude Sonnet 5.5 54.3% Sep 2026 Lab model card
7 Inkling 2 Small 43.1% Nov 2026 Lab model card
8 Qwen 3.8 27B 38.6% Aug 2026 Lab model card
9 Claude Opus 4.8 38.4% May 2026 Lab model card
10 o3 36% GUIRepair Apr 2025 Official leaderboard
11 Claude Sonnet 4 35.6% Refact.ai Agent May 2025 Official leaderboard
12 Claude Opus 4.7 34.5% Apr 2026 Lab model card
13 o4-mini 33.9% GUIRepair Apr 2025 Official leaderboard
14 Claude 3.7 Sonnet 31.3% OpenHands-Versa Feb 2025 Official leaderboard
15 GPT-4.1 31.1% GUIRepair Apr 2025 Official leaderboard
16 Claude Haiku 5.5 30.7% Oct 2026 Lab model card
17 GPT-4o Mar 2025 30.4% GUIRepair Mar 2025 Official leaderboard
18 Claude Sonnet 5 28.1% Jun 2026 Lab model card
19 Claude 3.5 Sonnet (October 2024) 25.3% Agentless Lite Oct 2024 Official leaderboard
20 Claude 3.5 Sonnet 12.2% SWE-agent Jun 2024 Official leaderboard
21 GPT-4o Aug 2024 12.2% SWE-agent Multimodal Aug 2024 Official leaderboard

The benchmark's own leaderboard has 10 entries, 9 of them models we track. Switch the scores above to rank them together.

4 models have held number one in labs’ own numbers since its release in October 2024 4 models have held number one across all independent runs since its release in October 2024 8 models have held number one with claims included since its release in October 2024

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 OpenAI
Own leaderboard Not tested since May 2025
o3 36%
Lab claims 4 leaders

Sources: Official SWE-bench Multimodal 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% 2024 2025 2026 2027 Near the ceiling (85%) Claude Fable 5.2 Claude Opus 5.5 Claude Mythos Preview o3 Claude 3.7 Sonnet Claude 3.5 Sonnet (October 2024) Claude 3.5 Sonnet 0% 20% 40% 60% 80% 100% 2024 2025 2026 2027 Near the ceiling (85%) Claude Fable 5.2 Claude Opus 5.5

Sources: Official SWE-bench Multimodal leaderboard and labs’ model cards

3 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.

Anthropic
Qwen
Thinking Machines
DateLaunch postScoreAs the post writes it
Nov 9, 2026 Claude Fable 5.2 74.1 SWE-bench Multimodal, adaptive thinking max effort, average of five trials (Table 8.1.A only)
Nov 5, 2026 Inkling 2 Small 43.1 SWE-bench Multimodal v2, 43.1%
Oct 7, 2026 Claude Haiku 5.5 30.7 SWE-bench Multimodal
Sep 28, 2026 Claude Sonnet 5.5 54.3 SWE-Bench Multimodal
Sep 22, 2026 Claude Opus 5.5 61.4 SWE-bench Multimodal
Sep 1, 2026 Claude Fable 5.1 54.7 SWE-bench Multimodal
Aug 14, 2026 Qwen 3.8 27B 38.6 Multimodal software engineering SWE-MM (SWE-bench Multimodal dev split, Claude Code)
Jul 24, 2026 Claude Opus 5 59.4 SWE-bench Multimodal
May 28, 2026 Claude Opus 4.8 38.4 SWE-bench Multimodal
Apr 16, 2026 Claude Opus 4.7 34.5 SWE-bench Multimodal
Apr 7, 2026 Claude Mythos Preview 59 SWE-bench Multimodal (internal implementation)

10 system cards report it, from 1 lab

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 Claude Fable 5.2 system card 74.1 SWE-bench Multimodal, adaptive thinking max effort, average of five trials (Table 8.1.A and Section 8.2) Capabilities
Oct 7, 2026 Claude Haiku 5.5 system card 30.7 SWE-bench Multimodal, average of five trials, max effort (Table 8.1.A) Capabilities
Sep 28, 2026 Claude Sonnet 5.5 system card 54.3 SWE-Bench Multimodal, average of five trials (Table 8.1.A) Capabilities
Sep 22, 2026 Claude Opus 5.5 system card 61.4 SWE-bench Multimodal, average of five trials, max effort (Table 8.1.A, 8.2) Capabilities
Sep 1, 2026 Claude Fable 5.1 system card 54.7 SWE-bench Multimodal (Table 8.1.A) Capabilities
Jul 24, 2026 Claude Opus 5 system card 59.4 SWE-bench Multimodal, average of five trials, internal harness (Table 8.1.A, 8.2) Capabilities
Jun 30, 2026 Claude Sonnet 5 system card 28.1 SWE-bench Multimodal, average of five trials, internal harness (8.2) Capabilities
May 28, 2026 Claude Opus 4.8 system card 38.4 SWE-bench Multimodal, internal harness, average of five trials, max effort (Table 8.1.A, 8.2) Capabilities
Apr 16, 2026 Claude Opus 4.7 system card 34.5 SWE-bench Multimodal, internal harness, average of 5 trials (Table 8.1.A, 8.2) Capabilities
Apr 7, 2026 Claude Mythos Preview system card 59 SWE-bench Multimodal on an internal harness (Appendix 8.6), average of 5 trials, trial range 56.4 to 61.4 (Table 6.3.A, 6.4) Capabilities

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