GPT-5.3 Codex: Benchmarks, Pricing & Context Window
GPT-5.3 Codex is a language model from OpenAI, released in February 2026, with multimodal input, a 400K-token context window, and pricing from $1.75/M input and $14.00/M output.
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
GPT-5.3 Codex benchmarks
Capability tiers
Standing within each category, adjusted for leaderboard depth.
Real tasks performance
High-confidence performance for GPT-5.3 Codex across real-world prompt categories. Only 95% intervals at most 4 points wide are shown.
Performance by conversation depth
How GPT-5.3 Codex holds up as conversations get longer.
Quality Tracker
GPT-5.3 Codex Performance Across Datasets
Scores sourced from the model's scorecard, paper, or official blog posts
llm-stats.com - Sun Sep 20 2026GPT-5.3 Codex pricing
Providers
GPT-5.3 Codex starts at $1.75 per million input tokens and $14.00 per million output tokens via OpenAI.
| Provider | Input $/M | Cached input $/M | Output $/M | Context in / out | TTFT p95 s | Output p5 c/s | Modalities in / out |
|---|---|---|---|---|---|---|---|
 OpenAI | $1.75 | — | $14.00 | 400.0K/128.0K | 3.00 | — | / |
Cached input is the discounted price for prompt tokens served from a provider cache. TTFT is time to first token. Output is characters per second; p5 is the sustained floor exceeded by 95% of observed requests.
GPT-5.3 Codex context window
Input and output token limits for GPT-5.3 Codex, plus how it ranks on long-context understanding.
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GPT-5.3 Codex latency
GPT-5.3 Codex time to first token, sustained output throughput, and failed-request rate from live model usage over the trailing 7 days.
GPT-5.3 Codex examples
Recent arena outputs from GPT-5.3 Codex, picked from the highest-ranked matchups.
GPT-5.3 Codex license
GPT-5.3 Codex is a proprietary model available under its provider's product and API terms.
- License
- Proprietary
- Hosted access
Proprietary license - usage restrictions apply
GPT-5.3 Codex resources
Official sources for GPT-5.3 Codex: provider documentation, official launch post.
GPT-5.3 Codex vs other models
The most-compared alternatives to GPT-5.3 Codex are Gemini 3 Pro, Gemini 3 Flash, Claude Mythos Preview. Open any pair side-by-side for benchmarks, pricing, context, and latency.
Models like GPT-5.3 Codex
Models ranked just above and below GPT-5.3 Codex by LLM Stats score.
FAQ
Common questions about GPT-5.3 Codex.