GPT 5.1 Codex — Currently unavailable
GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....
Technical specifications
Independent benchmarks
Scores below come from Artificial Analysis, an independent third party. BazaarLink does not participate in the testing.
Intelligence 24
Coding
Math 96
MMLU 86
GPQA 86
This modelCategory leader
Overall intelligence
#139out of 638 models
Aggregated across academic benchmarks
Intelligence
24
Top 22%This model24
Category leader53
Median12
Math
96
—This model96
Category leader99
Median53
MMLU Pro
86%
—This model86%
Category leader90%
Median75%
GPQA
86%
—This model86%
Category leader94%
Median69%
LiveCodeBench
85%
—This model85%
Category leader42%
Median42%
HLE
23%
—This model23%
Category leader53%
Median7%
SciCode
40%
—This model40%
Category leader60%
Median34%
IFBench
70%
—This model70%
Category leader83%
Median44%
τ²-Bench Telecom
83%
—This model83%
Category leader99%
Median46%
AA-LCR
67%
—This model67%
Category leader76%
Median40%
Terminal-Bench Hard
35%
—This model35%
Category leader66%
Median14%
Top 5 — CodingCoding Index leaderboard
2Claude Fable 5.1 (Adaptive Reasoning, Xhigh Effort, Default Fallback)
?/claude-fable-5-1-xhigh81$10 / $503Claude Fable 5.1 (Adaptive Reasoning, High Effort, Default Fallback)
?/claude-fable-5-1-high79$10 / $504GPT-5.6 Sol (xhigh)
openai/gpt-5-6-sol-xhigh78$4 / $20AASource: Artificial Analysis · Independent third-party evaluation; not influenced by BazaarLinkView full evaluation on AA →
Frequently Asked Questions
Can I still use GPT 5.1 Codex through BazaarLink?
No. GPT 5.1 Codex is currently unavailable through BazaarLink. See the active alternatives linked on this page.
Relay integrity checks
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BazaarLink Probe verifies endpoints that claim to serve this model and flags behavior that differs from the reference baseline.
View the full integrity report →Related models and links
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