Benchmark Almanac

Pwn CTF challenges (Anthropic)

Claude Opus 4.6 71.4% leads since February 2026
Only in system cards

Agents exploit insecure software on a remote server for privilege escalation or code execution in capture-the-flag challenges.

In-house Anthropic evaluation. The tasks are not public.

Made by
Anthropic
Released
February 2025
Kind
Capture-the-flag challenges
Level
Expert
Scored
Checked automatically
Answers
Agent task
Tasks
Kept private
Strongest model tested
Claude Opus 4.6 #37 on the capability index
Last in a system card
February 2026
Last model added
February 2026
6
Models scored in lab cards
7
System cards report it, from 1 lab

2 models share the top score of 71.4% among models released by February 2026

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.

The newest model with a score here came out in February 2026, and nobody has reported a newer one. Among the 20 highest-ranked models on the capability index, these have no score yet:

  1. 71.4 Claude Opus 4.6
  2. 71.4 Claude Sonnet 4.6
  3. 55.6 Claude Opus 4
  4. 42.9 Claude Opus 4.5
  5. 38.5 Claude 3.7 Sonnet
  6. 33.3 Claude Sonnet 4
  1. 1 Claude Opus 4.6 71.4%
  2. 2 Claude Sonnet 4.6 71.4%
  3. 3 Claude Opus 4 55.6%
  4. 4 Claude Opus 4.5 42.9%
  5. 5 Claude 3.7 Sonnet 38.5%
  6. 6 Claude Sonnet 4 33.3%

Source: Labs’ model cards

#ModelScoreSettingDateSource
1 Claude Opus 4.6 71.4% Feb 2026 Lab model card
2 Claude Sonnet 4.6 71.4% Feb 2026 Lab model card
3 Claude Opus 4 55.6% May 2025 Lab model card
4 Claude Opus 4.5 42.9% Nov 2025 Lab model card
5 Claude 3.7 Sonnet 38.5% Feb 2025 Lab model card
6 Claude Sonnet 4 33.3% May 2025 Lab model card

3 models have held number one in labs’ own numbers since its release in February 2025

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

Anthropic
Lab claims Not tested since Feb 2026
Claude Opus 4.6 71.4%

Source: 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.

Reported by the lab in its model card Best so far
0% 20% 40% 60% 80% 100% 2025 2026 Near the ceiling (85%) Claude Opus 4.6 Claude Opus 4 Claude 3.7 Sonnet 0% 20% 40% 60% 80% 100% 2025 2026 Near the ceiling (85%) Claude Opus 4.6 Claude Opus 4

Source: Labs’ model cards

Labs report it only in system cards

We read the headline results of 522 launch posts from 52 labs, and none of them list this benchmark. Some system cards do, below.

7 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
Feb 17, 2026 Claude Sonnet 4.6 system card 71.4 Pwn CTF, 5/7 challenges solved (Figure 6.4.4.A) Cyber risk
Feb 5, 2026 Claude Opus 4.6 system card 71.4 Pwn CTF challenges, 5/7 solved, pass@30 (Figure 8.4.4.A); details text lists 9 challenges Cyber risk
Nov 24, 2025 Claude Opus 4.5 system card 42.9 Pwn CTF challenges, 3/7 solved, pass@30 (Figure 7.4.4.A) Cyber risk
Sep 29, 2025 Claude Sonnet 4.5 system card Irregular private CTF challenges, Pwn category, mean pass@1, chart without printed values (5.3.1, Figure 5.3.1.A) Cyber risk
May 22, 2025 Claude Sonnet 4 system card 33.3 Pwn CTF, 3/9 solved, pass@30 (3/5 easy, 0/2 medium, 0/2 hard) (7.4.3 Pwn) Cyber risk
May 22, 2025 Claude Opus 4 system card 55.6 Pwn CTF, 5/9 solved, pass@30 (4/5 easy, 1/2 medium, 0/2 hard) (7.4.3 Pwn) Cyber risk
Feb 24, 2025 Claude 3.7 Sonnet system card 38.5 Pwn CTF, 5/13 solved, pass@30 (5/11 easy, 0/2 medium) (7.3.2) Cyber risk

More in Cybersecurity

All 115 in Cybersecurity
  • ExploitGym In use 869 real-vulnerability exploit-development tasks (userspace, V8, Linux kernel). Success means capturing a flag through the intended vulnerability. GPT-6 Astra 42.4%
  • ExploitBench In use 41 recent V8 JavaScript-engine N-day vulnerabilities. Progress measured by 16 grader-verified capability flags across five tiers. GPT-6 Astra 100%
  • CyberBench v1.1 (Vals) In use Agents work on OSS-Fuzz memory-safety bugs from ARVO images in two tracks. They write a proof-of-concept input that crashes the target, or patch the source so the crash stops and tests still pass. Muse Wonder 80.4%
  • SRE-Bench In use Software reverse engineering without source: 262 binary instances from 19 private programs, each with six graded objectives. GPT-6 Astra 56.9%
  • CyScenarioBench In use Scenario-based long-horizon security challenges in sandboxes, organized in task, scenario and campaign tiers. Evaluation set kept private. Gemini 4 Argon 100%
  • ExploitBench - Internal Port In use Agents develop working exploits for recently disclosed vulnerabilities to limit contamination. Scored as arbitrary code execution success rate. GPT-6 Cyber 42%