OpenAI
GPT-5.3 Codex
Code-specialized GPT tuned for repository-scale engineering and terminal work.
Intelligence
52.4 #355
AAQI 44.3
Output Speed
118 t/s
ITL 8.5 ms/tok
Blended price (3:1)
$4.812 /1M
In $1.75/M · Out $14/M
Context
400K
≈ 1,000 A4 pages · max out 8,192
Quality Domain Radar
6-Axis Frontier Evaluation vs Category Average & Flagship
GPT-5.3 Codex
Claude Mythos Preview (#1)
Average (68)
Radar axes are approximated from category scores where direct benchmark measurements are missing — see Methodology.
API deployment
Compare hosts & latency
Throughput, TTFT and cache pricing across Groq, Cerebras, Together, DeepInfra, Fireworks, Bedrock and Azure.
GroqCerebrasTogether AIDeepInfraFireworks AIAWS BedrockAzure AI
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Cerebras
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Fireworks AI
AWS Bedrock
Azure AIScores by Source
Category Scores
Benchmark Results
Model Details
Release date
Feb 4, 2026
Parameters
Not disclosed
License
Proprietary
Context Window
400,000 tokens
Input Price
$1.75/M
Output Price
$14/M
Output Speed
118 t/s
Time to First Token
—
Estimated monthly bill
Estimated monthly spend
$0.00
Calculating savings vs GPT-4o...
Cite & embed
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@misc{llmpodium2026gpt53codex,
title = {Benchmark Analysis and Intelligence Evaluation of GPT-5.3 Codex},
author = {LLMPodium Research},
year = {2026},
url = {https://llmpodium.com/models/gpt-5-3-codex}
}Embed Score Badge
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