GPT-5.1-Codex vs GPT-5 (medium)
Change modelsGPT-5.1-CodexOpenAI
GPT-5 (medium)OpenAI
IndexAll categories, out of 100.
52.9 ±5.7
53.0 ±9.2 best
GapIndex points below the top.
−0.1 · no clear gap
Top
CoverageIndex weight that has results.
85% best
65%
SpeedOutput tokens per second.
55/s
76/s best
EloLMArena rating and rank.
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ReleasedMonth of release.
2025-11
2025-08
Input / 1MUS dollars per 1M input tokens.
$1.25
$1.25
Output / 1MUS dollars per 1M output tokens.
$10.00
$10.00
1K chats2K tokens in, 500 out, each.
$7.50
$7.50
1K documents20K tokens in, 1K out, each.
$35.00
$35.00
1K agent tasks200K tokens in, 20K out, each.
$450.00
$450.00
ContextMaximum tokens in one request.
400K
400K
AgenticMulti-step tasks with tools.
56.1
60.2 best
CodingCode writing and repair.
49.8
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ReasoningLogic problems and puzzles.
51.4 best
48.1
MultimodalTasks with images and text.
49.5
51.8 best
KnowledgeFacts and expert knowledge.
55.7 best
54.9
MultilingualTasks in many languages.
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InstructionTasks with strict prompt rules.
54.4
55.0 best
MathMath problems.
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Benchmarks
8 sharedOnly GPT-5.1-Codex: 7
GPT-5.1-Codex
GPT-5 (medium)