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PostTrain Bench leaderboard
PostTrain Bench
6 models tested · Updated 2026-06-09 · Verified sources only
Claude Fable 5
leads at
41.4%
1
Claude Fable 5
Anthropic ·
Blog/Anthropic
· 2026-06-09
Score as cited in Kimi K3 blog (source: Anthropic official). Fable 5 hit fallbacks on 35% of tasks.
41.4%
2
Kimi K3
Moonshot AI ·
Blog/Moonshot AI
· 2026-07-16
KimiCode harness, Harbor implementation, 3 runs on H20.
36.6%
3
GPT-5.6 Sol
OpenAI ·
Blog/OpenAI
· 2026-07-09
Score as cited in Kimi K3 blog (source: OpenAI official).
34.6%
4
GLM-5.2
Z.ai ·
Blog/Z.ai
· 2026-06-13
Score as cited in Kimi K3 blog (source: Z.ai official).
34.3%
5
Claude Opus 4.8
Anthropic ·
Blog/Anthropic
· 2026-06-17
Score as cited in Kimi K3 blog (source: Anthropic official).
34.1%
6
GPT-5.5
OpenAI ·
Blog/OpenAI
· 2026-06-26
Score as cited in Kimi K3 blog (source: OpenAI official).
28.4%