GPT-5.3-Codex pricing & benchmarks
GPT-5.3-Codex is available from OpenAI at $1.75 per million input tokens and $14.00 per million output tokens ($4.81 blended at 3:1). It accepts up to 400,000 tokens of context. GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-a…
Pricing
Per million tokens · OpenRouter
Input$1.75
Output$14.00
Blended (3:1)$4.81
Specification
openai/gpt-5.3-codex
Context window400K
Max output128K
ReleasedFeb 2026
LicenceProprietary
Modalitiesin:text, in:image, in:file, out:text
Benchmarks
Independently run — not vendor self-reports. Every score links its source.
| Benchmark | Score | Config | Run | Source |
|---|---|---|---|---|
| SWE-bench Verified | 74.8% ±2.0 | — | 2026-02-25 | Independently run · Epoch AI |
Scores published by Epoch AI, 'AI Benchmarking Hub', used under CC BY 4.0.
Where to run GPT-5.3-Codex
3 options across 2 providers · 2.0× between cheapest and dearest. Blended at 3:1. ⚠ marks an option serving less context than the best available, or re-pricing above a prompt-length threshold. Bracketed labels are the provider's own service tier or region.
| Host | Blended $/1M | In / Out | Context | Uptime 24h |
|---|---|---|---|---|
| OpenAI | $4.81 | $1.75 / $14.00 | 400K | 99.7% |
| Azure | $4.81 | $1.75 / $14.00 | 400K | 100.0% |
| OpenAI (priority) | $9.63 | $3.50 / $28.00 | 400K | 99.7% |
Host prices and uptime from OpenRouter, synced 2026-08-08.
Compare GPT-5.3-Codex
FAQ
How much does GPT-5.3-Codex cost?
GPT-5.3-Codex costs $1.75 per million input tokens and $14.00 per million output tokens on OpenRouter. At a 3:1 input:output mix that blends to $4.81 per million tokens.
What is GPT-5.3-Codex's context window?
GPT-5.3-Codex accepts up to 400,000 tokens of context, and can generate up to 128,000 output tokens.