Benchmark Almanac

CyScenarioBench

Gemini 4 Argon 100% leads since October 2026
In use

Scenario-based long-horizon security challenges in sandboxes, organized in task, scenario and campaign tiers. Evaluation set kept private.

Scenario based evaluation of long-horizon offensive operations, scored stage by stage. Difficulty is rated with Irregular's SOLVE+ scoring system, which grades reconnaissance, OpSec, social engineering and planning against human skill levels. Irregular reports counts of 11 and 13 scenarios in different 2026 assessments, so the set grows. Not public.

Made by
Irregular
Released
December 2025
Kind
Capture-the-flag challenges
Level
Expert
Scored
Checked automatically
Answers
Agent task
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
17
Models scored in lab cards
1
Launch post lists it, from 1 lab
18
System cards report it, from 5 labs

Gemini 4 Argon leads with 100%

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.

17 models. Scroll sideways for the rest.

  1. 100.0 Gemini 4 Argon
  2. 76.3 Claude Fable 5.2
  3. 67.6 Claude Opus 5.5
  4. 61.0 GPT-6 Cyber
  5. 59.0 GPT-6 Astra
  6. 46.1 Claude Sonnet 5.5
  7. 33.7 Claude Opus 5
  8. 28.0 GPT-5.6 Sol
  9. 26.0 GPT-5.5
  10. 11.0 GPT-5.4
  11. 3.30 Claude Haiku 5.5
  12. 2.00 Muse Spark 1.3
  13. 0.50 Muse Spark 1.1
  14. 0.0 GPT-5.2 Codex
  15. 0.0 GPT-5.3 Codex
  16. 0.0 Muse Spark
  17. 0.0 Beam 1.0
  1. 1 Gemini 4 Argon 100%
  2. 2 Claude Fable 5.2 76.3%
  3. 3 Claude Opus 5.5 67.6%
  4. 4 GPT-6 Cyber 61%
  5. 5 GPT-6 Astra 59%
  6. 6 Claude Sonnet 5.5 46.1%
  7. 7 Claude Opus 5 33.7%
  8. 8 GPT-5.6 Sol 28%
  9. 9 GPT-5.5 26%
  10. 10 GPT-5.4 11%
  11. 11 Claude Haiku 5.5 3.30%
  12. 12 Muse Spark 1.3 2.00%
  13. 13 Muse Spark 1.1 0.50%
  14. 14 GPT-5.2 Codex 0%
  15. 15 GPT-5.3 Codex 0%
  16. 16 Muse Spark 0%
  17. 17 Beam 1.0 0%

Source: Labs’ model cards

#ModelScoreSettingDateSource
1 Gemini 4 Argon 100% Oct 2026 Lab model card
2 Claude Fable 5.2 76.3% Nov 2026 Lab model card
3 Claude Opus 5.5 67.6% Sep 2026 Lab model card
4 GPT-6 Cyber 61% Nov 2026 Lab model card
5 GPT-6 Astra 59% Sep 2026 Lab model card
6 Claude Sonnet 5.5 46.1% Sep 2026 Lab model card
7 Claude Opus 5 33.7% Jul 2026 Lab model card
8 GPT-5.6 Sol 28% Jun 2026 Lab model card
9 GPT-5.5 26% Apr 2026 Lab model card
10 GPT-5.4 11% Mar 2026 Lab model card
11 Claude Haiku 5.5 3.30% Oct 2026 Lab model card
12 Muse Spark 1.3 2.00% Oct 2026 Lab model card
13 Muse Spark 1.1 0.50% Jul 2026 Lab model card
14 GPT-5.2 Codex 0% Dec 2025 Lab model card
15 GPT-5.3 Codex 0% Feb 2026 Lab model card
16 Muse Spark 0% Jun 2026 Lab model card
17 Beam 1.0 0% Oct 2026 Lab model card

8 models have held number one in labs’ own numbers since its release in December 2025

Lab claims count from the day the card came out, independent runs from the model’s release.

OpenAI Anthropic Google DeepMind
Lab claims Passed 85% in Oct 2026, by Gemini 4 Argon
Gemini 4 Argon 100%

Source: Labs’ model cards

Google DeepMind’s own number for Gemini 4 Argon passed 85% in October 2026

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

Reported by the lab in its model card Best so far
0% 20% 40% 60% 80% 100% 2026 2027 Near the ceiling (85%) Gemini 4 Argon Claude Opus 5.5 GPT-6 Astra Claude Opus 5 GPT-5.6 Sol GPT-5.4 0% 20% 40% 60% 80% 100% 2026 2027 Near the ceiling (85%) Gemini 4 Argon Claude Opus 5.5

Source: Labs’ model cards

One lab 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.

OpenAI
DateLaunch postScoreAs the post writes it
Nov 5, 2026 GPT-6 Cyber 61 CyScenarioBench, average success rate across 11 long-horizon challenges

18 system cards report it, from 5 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 Claude Fable 5.2 system card 76.3 CyScenarioBench, Claude Mythos 5.2 completed 76.3% of all challenges (pre-release snapshot) Cyber risk
Nov 5, 2026 GPT-6 Cyber system card 61 CyScenarioBench, average success rate across 11 long-horizon challenges Cyber risk
Oct 23, 2026 Muse Spark 1.3 system card 2 CyScenarioBench pass@1, all 10 scenarios, Muse Spark 1.3 (max) (Table 1, Table 4). pass@20 = 30.0, 3 of 10 solved Cyber risk
Oct 13, 2026 Gemini 4 Argon system card 100 Irregular CyScenarioBench, challenges solved end-to-end 12/12; segments passed 77/82 (93.9%) (Figure 3.2, 3.2.2.3) Cyber risk
Oct 7, 2026 Claude Haiku 5.5 system card 3.3 CyScenarioBench, overall solve rate on the 10-challenge subset, pre-release snapshot, cyber mitigations off (3.3.2) Cyber risk
Oct 5, 2026 Beam 1.0 technical report 0 Irregular CTF suite, CyScenarioBench group, 0 of 10 solved Cyber risk
Sep 28, 2026 Claude Sonnet 5.5 system card 46.1 CyScenarioBench, average solve rate over a 10-challenge subset, cyber mitigations off (3.2.2, Figure 3.2.2.A) Cyber risk
Sep 22, 2026 Claude Opus 5.5 system card 67.6 CyScenarioBench, overall solve rate averaged over a 10-challenge subset, cyber mitigations off (3.3.2, Figure 3.3.2.A) Cyber risk
Sep 3, 2026 GPT-6 Astra system card 59 Irregular CyScenarioBench, average success rate (9 of 10 solved at least once) (10.1.2.6) Cyber risk
Jul 24, 2026 Claude Opus 5 system card 33.7 CyScenarioBench, overall solve rate averaged over a 9-challenge subset, mitigations off (3.3.4) Cyber risk
Jul 9, 2026 GPT-5.6 Sol system card 28 Irregular CyScenarioBench, average success, 7 of 11 challenges solved (9.1.2.5) Cyber risk
Jul 9, 2026 Muse Spark 1.1 system card 0.5 CyScenarioBench pass@1 (Table 1, Figure 11). pass@20 = 10.0, 1 of 10 scenarios Cyber risk
Jun 25, 2026 GPT-5.6 Sol system card 28 Irregular CyScenarioBench, average success, 7 of 11 challenges solved (9.1.2.5) Cyber risk
Jun 12, 2026 Muse Spark system card 0 CyScenarioBench, 10 scenarios (Table 1) Cyber risk
Apr 23, 2026 GPT-5.5 system card 26 Irregular CyScenarioBench, average success rate, 7 of 11 challenges solved (9.1.2.5) Cyber risk
Mar 5, 2026 GPT-5.4 system card 11 Irregular CyScenarioBench, average success rate, 5 of 11 challenges solved (5.1.2.4) Cyber risk
Feb 5, 2026 GPT-5.3 Codex system card 0 CyScenarioBench by Irregular, text says no challenges solved (5.1.2.4) Cyber risk
Dec 18, 2025 GPT-5.2 Codex system card addendum 0 Irregular CyScenarioBench, text says no challenges solved (5.1.2.4) Cyber risk

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