GPT-5.3 Codex
Model ID
- Context
- 400K
- 128K max output
- Input price
- $1.75
- per 1M tokens · OpenAI API
- Output price
- $14.00
- per 1M tokens
- Epoch Capabilities Index
- 156.8
- #16 of 71 listed
- LMArena Text
- —
- Not listed
Where to run it
2 offerings · prices as listed| Meter | Tier | Price |
|---|---|---|
| Input | Standard | $1.75 / 1M tokens |
| Fast tier | $3.50 / 1M tokens | |
| Output | Standard | $14.00 / 1M tokens |
| Fast tier | $28.00 / 1M tokens | |
| Cache read | Standard | $0.18 / 1M tokens |
| Fast tier | $0.35 / 1M tokens | |
Azure OpenAI in Foundry (opens in a new tab) gpt-5-3-codex | ||
| Input | Standard | $1.75 / 1M tokens |
| Output | Standard | $14.00 / 1M tokens |
| Cache read | Standard | $0.18 / 1M tokens |
Cited scores
From third-party leaderboards, not measured by us- Epoch Capabilities Index 156.8
#16 of 71 listed models · CI 153.8–160.4
Epoch AI, 'Capabilities & benchmarking'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/benchmarks'. Licensed CC BY 4.0. · License · as of Sep 26, 2026 · changes we made
- Epoch AI · SWE-bench Verified 74.8%
#14 of 23 listed models · high effort · ±1.98
Epoch AI, 'Capabilities & benchmarking'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/benchmarks'. Licensed CC BY 4.0. · License · as of Sep 26, 2026 · changes we made