Benchmark Almanac

GBAEval

Claude Opus 5 79.6% leads since Jul 2026 Not in model cards

Agents get 24 hours to write a Game Boy Advance emulator in Rust for WebAssembly. Replay, hardware, and audio tests compare it with Mesen2.

Mechanize describes it as one test case rather than a full benchmark, so each score rests on a single task.

Made by Mechanize Released May 2026 Building whole projects All tasks public Last model added Jul 2026 Scores refreshed 2 Nov 2026
Level
Research frontier Researchers, on open problems or tasks that take days
Scored
Checked automatically A program checks the result against an answer key, unit tests or the expected final state.
Answers
Code A program or patch run against tests.
mechanize-work/gba-eval 25 stars Leaderboard gbaeval.com
21
Models scored on its own leaderboard

Claude Opus 5 leads with 79.6% among models released by Jul 2026

Best score per model from the benchmark's own leaderboard, read on 2 Nov 2026. Where a model ran with several settings or harnesses, we keep its best.

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

21 models. Scroll sideways for the rest.

  1. 79.6 Claude Opus 5
  2. 74.5 Claude Fable 5
  3. 70.9 Claude Opus 4.8
  4. 65.4 Grok 4.5
  5. 65.3 Claude Sonnet 5
  6. 53.2 GPT-5.5
  7. 52.6 GPT-5.6 Sol
  8. 48.8 Claude Sonnet 4.6
  9. 48.4 Kimi K3
  10. 45.1 GPT-5.4
  11. 44.1 Claude Opus 4.6
  12. 43.8 Claude Opus 4.7
  13. 7.92 Muse Spark 1.1
  14. 6.70 Gemini 3.5 Flash
  15. 2.38 Grok Build 0.1
  16. 0.91 MiniMax-M3
  17. 0.86 Kimi K2.6
  18. 0.85 Gemini 3.1 Pro
  19. 0.85 Kimi K2.7 Code
  20. 0.41 Qwen3.7-Max
  21. 0.02 GLM-5.2
  1. 1 Claude Opus 5 79.6%
  2. 2 Claude Fable 5 74.5%
  3. 3 Claude Opus 4.8 70.9%
  4. 4 Grok 4.5 65.4%
  5. 5 Claude Sonnet 5 65.3%
  6. 6 GPT-5.5 53.2%
  7. 7 GPT-5.6 Sol 52.6%
  8. 8 Claude Sonnet 4.6 48.8%
  9. 9 Kimi K3 48.4%
  10. 10 GPT-5.4 45.1%
  11. 11 Claude Opus 4.6 44.1%
  12. 12 Claude Opus 4.7 43.8%
  13. 13 Muse Spark 1.1 7.92%
  14. 14 Gemini 3.5 Flash 6.70%
  15. 15 Grok Build 0.1 2.38%
  16. 16 MiniMax-M3 0.91%
  17. 17 Kimi K2.6 0.86%
  18. 18 Gemini 3.1 Pro 0.85%
  19. 19 Kimi K2.7 Code 0.85%
  20. 20 Qwen3.7-Max 0.41%
  21. 21 GLM-5.2 0.02%
#ModelScoreSettingDateSource
1 Claude Opus 5 79.6% Jul 2026 Official leaderboard
2 Claude Fable 5 74.5% Jun 2026 Official leaderboard
3 Claude Opus 4.8 70.9% May 2026 Official leaderboard
4 Grok 4.5 65.4% Jul 2026 Official leaderboard
5 Claude Sonnet 5 65.3% Jun 2026 Official leaderboard
6 GPT-5.5 53.2% Apr 2026 Official leaderboard
7 GPT-5.6 Sol 52.6% Codex Jul 2026 Official leaderboard
8 Claude Sonnet 4.6 48.8% Feb 2026 Official leaderboard
9 Kimi K3 48.4% Jul 2026 Official leaderboard
10 GPT-5.4 45.1% Mar 2026 Official leaderboard
11 Claude Opus 4.6 44.1% Feb 2026 Official leaderboard
12 Claude Opus 4.7 43.8% Apr 2026 Official leaderboard
13 Muse Spark 1.1 7.92% goose Jul 2026 Official leaderboard
14 Gemini 3.5 Flash 6.70% goose May 2026 Official leaderboard
15 Grok Build 0.1 2.38% May 2026 Official leaderboard
16 MiniMax-M3 0.91% goose Jun 2026 Official leaderboard
17 Kimi K2.6 0.86% goose Apr 2026 Official leaderboard
18 Gemini 3.1 Pro 0.85% Feb 2026 Official leaderboard
19 Kimi K2.7 Code 0.85% goose Jun 2026 Official leaderboard
20 Qwen3.7-Max 0.41% goose May 2026 Official leaderboard
21 GLM-5.2 0.02% goose Jun 2026 Official leaderboard

Epoch AI has scores for 23 models. We plot every source in the charts below.

4 models have held number one since its release in May 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 Epoch AI’s runs.

OpenAI Anthropic
Own leaderboard Not tested since Jul 2026
Claude Opus 5 79.6%
Epoch AI runs Not tested since Jul 2026
Claude Opus 5 79.6%

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 Run or collected by Epoch AI Best so far
0% 20% 40% 60% 80% 100% 2026 Near the ceiling (85%) Claude Opus 5 Claude Fable 5 GPT-5.5 Claude Sonnet 4.6 Claude Opus 4.6 0% 20% 40% 60% 80% 100% 2026 Near the ceiling (85%) Claude Opus 5 Claude Opus 4.8

No lab model card reports it yet

We read the headline results of 479 launch posts from 51 labs, and none of them list this benchmark.

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