GPT-5.3 Codex
by ZenMux · listed Mar 2026RT
Coding-optimized GPT model for repository edits, reviews, and agentic software work
Current rates USD per 1M tokens
Input$1.75
Output$14.00
Cache read—
Cache write—
Against the market
On the record
- Model id
openai/gpt-5.3-codex- Context window
- 400K tokens
- Max output
- 128K tokens
- Input modalities
- text
- Output modalities
- text
- Reasoning
- yes
- Tool calls
- yes
- Open weights
- no
- Knowledge cutoff
- Aug 2025
- Released
- 2026-03-20
- Last updated
- 2026-03-20
- Provider docs
- docs.zenmux.ai
Back of the envelope
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