GPT-5.1 vs GPT-5.1-Codex
Change modelsGPT-5.1OpenAI
GPT-5.1-CodexOpenAI
IndexAll categories, out of 100.
55.3 ±3.7 best
52.9 ±5.7
GapIndex points below the top.
Top
−2.4 · no clear gap
CoverageIndex weight that has results.
95% best
85%
SpeedOutput tokens per second.
50/s
55/s best
EloLMArena rating and rank.
1422
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ReleasedMonth of release.
2025-11
2025-11
Input / 1MUS dollars per 1M input tokens.
$1.25
$1.25
Output / 1MUS dollars per 1M output tokens.
$10.00
$10.00
Batch output / 1MBatch price per 1M output tokens.
$5.00
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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.
52.4
56.1 best
CodingCode writing and repair.
53.5 best
49.8
ReasoningLogic problems and puzzles.
56.4 best
51.4
MultimodalTasks with images and text.
58.4 best
49.5
KnowledgeFacts and expert knowledge.
57.2 best
55.7
MultilingualTasks in many languages.
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InstructionTasks with strict prompt rules.
57.1 best
54.4
MathMath problems.
57.5
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Benchmarks
14 sharedOnly GPT-5.1: 30Only GPT-5.1-Codex: 1
GPT-5.1
GPT-5.1-Codex