OpenAI · Released Feb 24, 2026
GPT-5.3-Codex
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…
- Top 15%Terminal-Bench
- Top 18%METR time horizon
- Top 35%Vending-Bench 2
- Top 44%SWE-bench Verified
- Released
- Feb 24 2026
- Context window
- 400K 128K out
- Input / 1M tokens
- $1.75 from $1.59
- Output / 1M tokens
- $14.00 from $8.00
Where to run it
32 providers compared
Included in GitLab Duo. Cheapest: CommandCode at $2.00 / $8.00 per 1M input / output tokens — 74% less than the priciest option.
| Provider | Input | Output | Cache read | Context | Max output | Uptime | vs. best |
|---|---|---|---|---|---|---|---|
| GitLab Duosubscription plan | Plan | Plan | — | 400K | 128K | — | Plan |
| CommandCode | $2.00 | $8.00 | $0.50 | 400K | 128K | — | Cheapest |
| Poe | $1.59 | $12.73 | $0.16 | 400K | 128K | — | +25% |
| Azure | $1.75 | $14.00 | $0.17 | 400K | 128K | 100%24h | +38% |
| OpenAI | $1.75 | $14.00 | $0.17 | 400K | 128K | 100%24h | +38% |
| AIHubMix | $1.75 | $14.00 | $0.17 | 400K | 128K | — | +38% |
| LLM Gateway | $1.75 | $14.00 | $0.17 | 400K | 128K | — | +38% |
| Opper | $1.75 | $14.00 | $0.17 | 400K | 128K | — | +38% |
| ZenMux | $1.75 | $14.00 | $0.17 | 400K | 128K | — | +38% |
| OrcaRouter | $1.75 | $14.00 | $0.17 | 400K | 128K | — | +38% |
| Vivgrid | $1.75 | $14.00 | $0.17 | 400K | 128K | — | +38% |
| Impossibl | $1.75 | $14.00 | $0.17 | 400K | 128K | — | +38% |
| Venice AI | $1.75 | $14.00 | $0.17 | 400K | 128K | — | +38% |
| NanoGPT | $1.75 | $14.00 | $0.17 | 400K | 128K | — | +38% |
| Kilo Gateway | $1.75 | $14.00 | $0.17 | 400K | 128K | — | +38% |
| Neon | $1.75 | $14.00 | $0.17 | 400K | 128K | — | +38% |
| DevPass (LLM Gateway) | $1.75 | $14.00 | $0.17 | 400K | 128K | — | +38% |
| Azure Cognitive Services | $1.75 | $14.00 | $0.17 | 400K | 128K | — | +38% |
| Requesty | $1.75 | $14.00 | $0.17 | 400K | 128K | — | +38% |
| DigitalOcean | $1.75 | $14.00 | $0.17 | 400K | 128K | — | +38% |
| GitHub Copilot | $1.75 | $14.00 | $0.17 | 400K | 128K | — | +38% |
| Abacus | $1.75 | $14.00 | — | 400K | 128K | — | +38% |
| OpenCode | $1.75 | $14.00 | $0.17 | 400K | 128K | — | +38% |
| FastRouter | $1.75 | $14.00 | $0.17 | 400K | 128K | — | +38% |
| Pioneer | $1.75 | $14.00 | $0.17 | 400K | 128K | — | +38% |
| Eden AI | $1.75 | $14.00 | $0.17 | 400K | 128K | — | +38% |
| Prime Inference | $1.75 | $14.00 | — | 400K | 128K | — | +38% |
| FreeModel | $1.75 | $14.00 | $0.17 | 400K | 128K | — | +38% |
| FrogBot | $1.75 | $14.00 | $0.17 | 400K | 128K | — | +38% |
| Ofox | $1.75 | $14.00 | $0.18 | 400K | 128K | — | +38% |
| OpenAIfast | $3.50 | $28.00 | $0.35 | 400K | 128K | — | +175% |
| Vercel AI Gateway | $3.50 | $28.00 | $0.35 | 400K | 128K | — | +175% |
| AI/ML API | $4.81 | $38.51 | $0.48 | 400K | 128K | — | +278% |
Value
Price vs. performance
GPT-5.3-Codex Other OpenAI Other labs Value frontier · SWE-bench Verified vs. input price per 1M tokens (log scale) · Drag to pan, pinch or Ctrl + scroll to zoom, double-click to zoom in.
Benchmarks
5 benchmark scores
| Benchmark | Score | Rank | Leader |
|---|---|---|---|
| SWE-bench VerifiedSoftware engineering · Real GitHub issues fixed in Python repos | 74.8% | #14of 32 | Claude Opus 4.783.5% |
| Terminal-BenchSoftware engineering · Tasks completed with the programs in a real terminal (best agent) | 78.4% | #6of 40 | GPT-5.584.7% |
| METR time horizonSoftware engineering · Length of software task solved more often than not | 5.8 h | #4of 23 | Claude Opus 4.612 h |
| Vending-Bench 2Agents & computer use · Run a simulated vending business for a year (final balance) | $5,940 | #21of 61 | GPT-6 Astra$15,515 |
| WebDev ArenaDesign & visual · People vote on which model builds the better website (Elo) | 1370 | #71of 90 | Claude Opus 5.51820 |
Specs
Details
- Model ID
openai/gpt-5.3-codex- Developer
- OpenAI
- Release date
- Feb 24, 2026 ·
- Context window
- 400,000 tokens
- Max output
- 128,000 tokens
- API price
- $1.75 / $14.00 per 1M input / output tokens
- Providers
- 32
- Input types
- text, image, file
- Reasoning
- Yes
- Tool calling
- Yes
- Open weights
- No
- Free tier
- No
Release date and prices from OpenRouter's catalog; providers from OpenRouter and models.dev. Buying directly from a provider can cost a little differently. Speed, latency and uptime are measured on OpenRouter only; uptime is the share of OpenRouter requests each provider served over the last day. Benchmark scores are the best result per benchmark from Epoch AI, licensed CC BY 4.0. Rank counts every model tracked here with a score.