GPT-5.3 Codex
Overview
Overview
GPT-5.3-Codex is OpenAI's most capable coding model, combining frontier agentic coding capabilities, improvements in aesthetics, and context compaction. It sets new state-of-the-art results on Terminal-Bench 2.0 (77.3%), OSWorld-Verified (64.7%), and SWE-Lancer IC Diamond (81.4%). First model classified as High capability for cybersecurity under OpenAI's Preparedness Framework. Available in the Codex app and API.
GPT-5.3 Codex was released on February 5, 2026. API access is available through OpenAI.
Performance
Timeline
Specifications
Benchmarks
Benchmarks
GPT-5.3 Codex Performance Across Datasets
Scores sourced from the model's scorecard, paper, or official blog posts
llm-stats.com - Fri Feb 06 2026Pricing
Pricing
Pricing, performance, and capabilities for GPT-5.3 Codex across different providers:
| Provider | Input ($/M) | Output ($/M) | Max Input | Max Output | Latency (s) | Throughput | Quantization | Input | Output |
|---|---|---|---|---|---|---|---|---|---|
OpenAI | $1.75 | $14.00 | 400.0K | 128.0K | 3.0 | 50.0 c/s | — | Text Image Audio Video | Text Image Audio Video |
API Access
API Access Coming Soon
API access for GPT-5.3 Codex will be available soon through our gateway.
Recent Posts
Recent Reviews
Blog Posts
Claude Opus 4.6 vs GPT-5.3 Codex: The Definitive Frontier Battle
In-depth comparison of Claude Opus 4.6 and GPT-5.3 Codex across benchmarks, pricing, context windows, agentic capabilities, and real-world performance. Discover which frontier AI model best fits your needs.
Sebastian Crossa
GPT-5.3 Codex: Agentic AI & The Future of Coding
A comprehensive analysis of OpenAI's GPT-5.3 Codex — the first model instrumental in its own creation, featuring a 400K context window, 128K output limit, state-of-the-art coding benchmarks, and agentic capabilities that redefine the developer experience.
Sebastian CrossaFAQ
Common questions about GPT-5.3 Codex