GPT-5.3 Codex
OpenAIReleased Feb 5, 2026
GPT-5.3 Codex is not ranked on LMArena yet; output price $14.00 per 1M tokens.
Key metrics
More from OpenAI
| # | Model | Arena | Intel. | Output $ | tok/s |
|---|---|---|---|---|---|
| 22 | GPT-5.5 | 1471.5 | 38.4 | $30.00 | – |
| 27 | GPT-5.4 | 1469.0 | 39.0 | $15.00 | – |
| 35 | GPT-5.6 Sol | 1457.3 | 47.0 | $20.00 | – |
| 44 | GPT-5.6 Terra | 1446.5 | 42.1 | $12.00 | 111 |
| 45 | GPT-6.1 Sol | 1446.5 | 51.8 | $10.00 | 58 |
| 48 | GPT-5.1 | 1442.7 | 24.7 | $10.00 | – |
Pricing
- Official API list price: $1.75 input and $14.00 output per 1M tokens (USD).
- At a typical 3:1 input-to-output ratio, the blended cost is about $4.81 per 1M tokens.
- Among 78 models with an output price, it is the #61 cheapest.
- The cheapest OpenRouter route charges $1.75 input / $14.00 output.
Sources & methodology
GPT-5.3 Codex (OpenAI): Intelligence Index 32.5, $1.75 in / $14.00 out per 1M tokens, 400K context. Data updated Oct 9, 2026.
- LMArena — Arena score, 95% confidence interval, votes and rank.
- Artificial Analysis — Intelligence / Coding Index, output speed and latency (medians).
- OpenRouter — Route prices, context length and listing date.
Arena scores use the Bradley-Terry model (not Elo); ± is the half-width of the 95% confidence interval. Latency figures are Artificial Analysis medians; for reasoning models, time to first token and to first answer include the thinking phase. Data syncs daily at 14:20 (UTC+8).
FAQ
What rank is GPT-5.3 Codex right now?
GPT-5.3 Codex has not been scored by LMArena yet, so it is not ranked here.
What does GPT-5.3 Codex cost via API?
Input $1.75 / output $14.00 per 1M tokens (official API list price; the OpenRouter quote when no official price is available). At a typical 3:1 input-to-output ratio, the blended cost is about $4.81 per 1M tokens.
How fast is GPT-5.3 Codex?
Artificial Analysis measures about 94 output tokens per second, 50 s to the first token and 50 s to the first answer token; it is a reasoning model, so latency includes thinking time.
Is GPT-5.3 Codex open source? Can it be self-hosted?
GPT-5.3 Codex is a closed model, available only via official APIs or hosted services.
What is the context length of GPT-5.3 Codex?
400K (400,000 tokens, as listed on OpenRouter).