Glimmer Index
Plus $4/mo

GPT-5.3 Codex

OpenAI · Released Feb 5, 2026 · Closed weights
Latest GPT-5.3 Codex

Coding-optimized GPT model for repository edits, reviews, and agentic software work

Strongest at
Science
Top 12% of the past year's models · one benchmark so far
Price per 1M tokens
$1.75 / $14
input / output · OpenAI
Context window
400K
tokens in · 128K out
Since the last one
56 days
after GPT-5.2 Codex
Lab announcement ↗Open in the timeline

Capability profile

Where it lands among 91 models released in the past year. 50 is the average model.

This modelGPT-5.2 CodexEvery model from the past year
Coding
56Top 46% · 1 test
Writing
No results yet
Reading & documents
No results yet
Reasoning
No results yet
Math
No results yet
Science
72Top 12% · 1 test
Visual reasoning
No results yet
Computer use
No results yet
Where these scores come from

Each capability combines the published benchmarks listed here, rescaled so 50 is the reference average and 15 points is one standard deviation. A hollow marker rests on a single benchmark.

Price against capability

The shaded corner holds anything better and cheaper. Prices blend input and output 3 to 1.

2 models from the past year score higher on Science for less: Claude Sonnet 5.5, Gemini 3.1 Pro Preview.

$0.1$0.3$1$3$10$30406080100GPT-6.1 Terra: 69, $2 per 1MDeepSeek V4.1 Flash 1017: 69, $0.52 per 1MMuse Spark Open: 66, $2 per 1MClaude Haiku 5.5: 65, $0.2 per 1MMistral Large 4: 65, $2.06 per 1MGemini 4 Argon: 71, $4 per 1MGPT-6.1 Sol: 70, $4 per 1MClaude Sonnet 5.5: 76, $4 per 1MGPT-6 Sol: 69, $4 per 1MGPT-6 Luna: 67, $0.2 per 1MClaude Opus 5.5: 108, $8 per 1MGrok 4.7: 61, $3 per 1MDeepSeek V4.1 Flash: 62, $0.21 per 1MGPT-6 Astra: 101, $20 per 1MGemini 3.8 Flash: 70, $1.5 per 1MClaude Fable 5.1: 90, $20 per 1MGLM-5.3-Flash: 67, $0.24 per 1MGLM-5.3: 60, $2.15 per 1MGemini 3.7 Flash: 54, $1.5 per 1MDeepSeek V4 Pro 0813: 66, $0.99 per 1MQwen3.8 2.4T A95B: 70, $3 per 1MGrok 4.6: 58, $3 per 1MMuse Spark 1.2: 60, $2 per 1MQwen3.8 Max: 68, $3 per 1MDeepSeek V4 Flash 0731: 64, $0.15 per 1MClaude Opus 5: 79, $10 per 1MGemini 3.6 Flash: 63, $1.5 per 1MGemini 3.5 Flash Lite: 53, $0.85 per 1MKimi K3: 62, $6 per 1MQwen3.7 Flash: 62, $0.055 per 1MGPT-5.6 Terra: 61, $4.5 per 1MGPT-5.6 Sol: 73, $8 per 1MGPT-5.6 Luna: 54, $0.45 per 1MGrok 4.5: 59, $3 per 1MClaude Sonnet 5: 66, $4 per 1MGLM-5.2: 67, $2.15 per 1MKimi K2.7 Code: 60, $1.71 per 1MClaude Fable 5: 71, $20 per 1MQwen3.7 Plus: 65, $0.7 per 1MClaude Opus 4.8: 63, $10 per 1MQwen3.7 Max: 67, $3.75 per 1MGemini 3.5 Flash: 65, $3.38 per 1MGPT-5.5 Instant: 62, $11.2 per 1MDeepSeek V4 Pro: 51, $1.19 per 1MDeepSeek V4 Flash: 49, $0.18 per 1MGPT-5.5 Pro: 69, $67.5 per 1MGPT-5.5: 73, $11.2 per 1MQwen3.6 27B: 64, $1.35 per 1MKimi K2.6: 62, $1.71 per 1MGrok 4.3: 52, $1.56 per 1MClaude Opus 4.7: 70, $10 per 1MQwen3.6 35B-A3B: 52, $0.84 per 1MGLM-5.1: 62, $2.15 per 1MGemma 4 31B IT: 57, $0.25 per 1MGPT-5.4 nano: 56, $0.46 per 1MGPT-5.4 mini: 62, $1.69 per 1MNemotron 3 Super 120B A12B: 44, $0.82 per 1MGPT-5.4 Pro: 75, $67.5 per 1MGPT-5.4: 71, $5.62 per 1MGemini 3.1 Flash Lite Preview: 54, $0.56 per 1MGemini 3.1 Flash Lite: 50, $0.56 per 1MQwen3.5 Flash: 62, $0.18 per 1MQwen3.5 9B: 59, $0.19 per 1MQwen3.5 35B-A3B: 62, $0.69 per 1MQwen3.5 27B: 45, $0.82 per 1MGemini 3.1 Pro Preview: 73, $4.5 per 1MClaude Sonnet 4.6: 63, $6 per 1MQwen3.5 Plus: 63, $0.9 per 1MQwen3.5 397B-A17B: 64, $1.35 per 1MGLM-5: 58, $1.55 per 1MClaude Opus 4.6: 69, $10 per 1MQwen3 Coder Next: 42, $0.29 per 1MKimi K2.5: 53, $1 per 1MGLM-4.7: 62, $1 per 1MGemini 3 Flash Preview: 63, $1.12 per 1MGPT-5.2: 66, $4.81 per 1MDeepSeek V3.2: 62, $0.32 per 1MClaude Opus 4.5: 60, $10 per 1MGPT-5.1: 61, $3.44 per 1MKimi K2 Thinking: 47, $1.07 per 1MGPT-5.3 Codex: 72, $4.81 per 1MGPT-5.3 CodexPrice per 1M tokens →↑ Science$0.1$1$10406080100GPT-6.1 Terra: 69, $2 per 1MDeepSeek V4.1 Flash 1017: 69, $0.52 per 1MMuse Spark Open: 66, $2 per 1MClaude Haiku 5.5: 65, $0.2 per 1MMistral Large 4: 65, $2.06 per 1MGemini 4 Argon: 71, $4 per 1MGPT-6.1 Sol: 70, $4 per 1MClaude Sonnet 5.5: 76, $4 per 1MGPT-6 Sol: 69, $4 per 1MGPT-6 Luna: 67, $0.2 per 1MClaude Opus 5.5: 108, $8 per 1MGrok 4.7: 61, $3 per 1MDeepSeek V4.1 Flash: 62, $0.21 per 1MGPT-6 Astra: 101, $20 per 1MGemini 3.8 Flash: 70, $1.5 per 1MClaude Fable 5.1: 90, $20 per 1MGLM-5.3-Flash: 67, $0.24 per 1MGLM-5.3: 60, $2.15 per 1MGemini 3.7 Flash: 54, $1.5 per 1MDeepSeek V4 Pro 0813: 66, $0.99 per 1MQwen3.8 2.4T A95B: 70, $3 per 1MGrok 4.6: 58, $3 per 1MMuse Spark 1.2: 60, $2 per 1MQwen3.8 Max: 68, $3 per 1MDeepSeek V4 Flash 0731: 64, $0.15 per 1MClaude Opus 5: 79, $10 per 1MGemini 3.6 Flash: 63, $1.5 per 1MGemini 3.5 Flash Lite: 53, $0.85 per 1MKimi K3: 62, $6 per 1MQwen3.7 Flash: 62, $0.055 per 1MGPT-5.6 Terra: 61, $4.5 per 1MGPT-5.6 Sol: 73, $8 per 1MGPT-5.6 Luna: 54, $0.45 per 1MGrok 4.5: 59, $3 per 1MClaude Sonnet 5: 66, $4 per 1MGLM-5.2: 67, $2.15 per 1MKimi K2.7 Code: 60, $1.71 per 1MClaude Fable 5: 71, $20 per 1MQwen3.7 Plus: 65, $0.7 per 1MClaude Opus 4.8: 63, $10 per 1MQwen3.7 Max: 67, $3.75 per 1MGemini 3.5 Flash: 65, $3.38 per 1MGPT-5.5 Instant: 62, $11.2 per 1MDeepSeek V4 Pro: 51, $1.19 per 1MDeepSeek V4 Flash: 49, $0.18 per 1MGPT-5.5 Pro: 69, $67.5 per 1MGPT-5.5: 73, $11.2 per 1MQwen3.6 27B: 64, $1.35 per 1MKimi K2.6: 62, $1.71 per 1MGrok 4.3: 52, $1.56 per 1MClaude Opus 4.7: 70, $10 per 1MQwen3.6 35B-A3B: 52, $0.84 per 1MGLM-5.1: 62, $2.15 per 1MGemma 4 31B IT: 57, $0.25 per 1MGPT-5.4 nano: 56, $0.46 per 1MGPT-5.4 mini: 62, $1.69 per 1MNemotron 3 Super 120B A12B: 44, $0.82 per 1MGPT-5.4 Pro: 75, $67.5 per 1MGPT-5.4: 71, $5.62 per 1MGemini 3.1 Flash Lite Preview: 54, $0.56 per 1MGemini 3.1 Flash Lite: 50, $0.56 per 1MQwen3.5 Flash: 62, $0.18 per 1MQwen3.5 9B: 59, $0.19 per 1MQwen3.5 35B-A3B: 62, $0.69 per 1MQwen3.5 27B: 45, $0.82 per 1MGemini 3.1 Pro Preview: 73, $4.5 per 1MClaude Sonnet 4.6: 63, $6 per 1MQwen3.5 Plus: 63, $0.9 per 1MQwen3.5 397B-A17B: 64, $1.35 per 1MGLM-5: 58, $1.55 per 1MClaude Opus 4.6: 69, $10 per 1MQwen3 Coder Next: 42, $0.29 per 1MKimi K2.5: 53, $1 per 1MGLM-4.7: 62, $1 per 1MGemini 3 Flash Preview: 63, $1.12 per 1MGPT-5.2: 66, $4.81 per 1MDeepSeek V3.2: 62, $0.32 per 1MClaude Opus 4.5: 60, $10 per 1MGPT-5.1: 61, $3.44 per 1MKimi K2 Thinking: 47, $1.07 per 1MGPT-5.3 Codex: 72, $4.81 per 1MGPT-5.3 CodexPrice per 1M tokens →↑ Science

OpenAI $1.75 / $14 · OpenRouter $1.75 / $14 · Cached input $0.17

Since GPT-5.2 Codex

4 releases in the GPT-5.3 Codex line.

GPT-5-CodexSep 15, 202559dGPT-5.1 CodexNov 13, 202528dGPT-5.2 CodexDec 11, 202556dGPT-5.3 CodexFeb 5, 2026
Released56 days later
Price in / out$1.75 / $14same price
Context400Ksame
Coding56+0.8
ECI STANDING#24 of 270
SCORE157.09153.56–161.38 CI
FRONTIER LAGLaunched in the leadNothing released before it had scored higher.
SCORES LIKE THESE MODELSGPT-5.4OpenAI · Mar 2026157.31Muse Spark 1.3Meta AI · Sep 2026157.21Claude Sonnet 5Anthropic · Jun 2026156.88Claude Opus 4.7Anthropic · Apr 2026156.79
Full Epoch Capabilities Index ranking ↗

Epoch benchmark boards

Best result on each board it has run. The tick marks the leader.

WeirdML
79%#12 of 141
Terminal Bench
78%#6 of 50
METR Time Horizons
74%#6 of 42
SWE-Bench verified
75%#15 of 32

OpenAI's past year

24 release days in the past year, about one every 15 days. The next is expected around Nov 8, 2026. Forecasts ↗

NovDecJanFebMarAprMayJunJulAugSepOctNov

Specifications

RELEASE DATEFeb 5, 2026
WEIGHTSClosed weights
CONTEXT WINDOW400K
MAX OUTPUT128K
REASONINGNot listed
TOOL CALLINGNot listed
INPUTStext, image/jpeg, image/png, image/gif, image/webp, application/pdf
OUTPUTStext

Models.dev record ↗

Specifications and prices from Models.dev; availability and limits may differ by provider. Benchmarks from Epoch AI (CC BY 4.0), LiveBench and the other sources named above.