GPT-5.3-Codex

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Prime Inferenceopenai/gpt-5.3-codexgpt-codex

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Quick Info

Provider: Prime Inference
Model key: openai/gpt-5.3-codex
Release date: Feb 5, 2026
Last updated: Feb 5, 2026
Knowledge cutoff: 2025-08-31
Input modalities
Output modalities
Capabilities

Cost

Input token cost: $1.75
Output token cost: $14.00

Limits

Output tokens: 128,000 tokens
Context window: 400,000 tokens

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Rates are shown per one million tokens. Combined means one million input plus one million output tokens.

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Latest news about GPT-5.3-Codex

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CoverageBenchmark

BenchLM's tracker entry for GPT-5.3 Codex, data as of September 3, 2026, lists the model as released February 5, 2026, with a 400K token context window, an aggregate capability score of 65.5 out of 100, and a rank of 42 of 231 tracked models. It reports API pricing of $1.75 per million input tokens and $14 per million The same BenchLM page publishes category-level percentiles for GPT-5.3 Codex against its eligible cohort: 86th percentile in Agentic (rank 21 of 144) and 83rd percentile in Coding (rank 26 of 149), while Reasoning, Knowledge, Math, Multilingual, Multimodal, and Instruction Following are not ranked. The tracker notes th