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GPT-5.3 Codex
openai·openai/gpt-5.3-codex·GA·Closed·gpt-codex series
Coding-optimized GPT model for repository edits, reviews, and agentic software work
At a glance
Official price$1.75 / $14.00 per 1M
Cache read $0.175 · OpenAI
Lowest paid$1.57 / $12.60
Requesty Gateway · 1.4× spread
Context400,000
Output limit128,000
Capabilities
✓ Reasoning✓ Tool use✓ Structured outputTemperature✓ Attachments
⚠ Providers report capability flags inconsistently
Modalities
TextImagePDF
Knowledge cutoff2025-08-31
Released / updated2026-02-05 / 2026-02-05
Quality & performanceArtificial Analysis · Intelligence Index v4.1 · rep. tier xhigh
Intelligence45.5
Value11
Coding—
Agentic—
Output speed125 tok/s
TTFT74.62 s
Value formulaIQ 45.5 ÷ min blended $4.331 = 11
Quality is independently evaluated by Artificial Analysis. Speed/latency are model-level medians.
Available at 27 providers27 with public prices
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| Requesty | Gateway | $1.57 | $12.60 | $0.158 | — | 400,000 | 128,000 | |
| Poe | Gateway | $1.60 | $13.00 | $0.16 | — | 400,000 | 128,000 | |
| OrcaRouter | Gateway | $1.75 | $14.00 | $0.175 | — | 400,000 | 128,000 | |
| NanoGPT | Gateway | $1.75 | $14.00 | $0.175 | — | 400,000 | 128,000 | |
| Impossibl | Gateway | $1.75 | $14.00 | $0.175 | — | 400,000 | 128,000 | |
| OpenRouter | Gateway | $1.75 | $14.00 | $0.175 | — | 400,000 | 128,000 | |
| OpenAIOfficial | First-party | $1.75 | $14.00 | $0.175 | — | 400,000 | 128,000 | |
| Vivgrid | Gateway | $1.75 | $14.00 | $0.175 | — | 400,000 | 128,000 | |
| Cloudflare AI Gateway | Cloud | $1.75 | $14.00 | $0.175 | — | 400,000 | 128,000 | |
| FastRouter | Gateway | $1.75 | $14.00 | — | — | 400,000 | 128,000 | |
Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.
Your usage cost
1Requesty$774.90
2Poe$797.20
3OrcaRouter$861.00
4NanoGPT$861.00
5Impossibl$861.00
6OpenRouter$861.00
7OpenAI · Official$861.00
Switch to Requesty to save $86.10/mo (10%). The gap is small, so staying on the official channel is fine.
Note: this is a gateway; verify availability and rate limits yourself.
Benchmark3 items
| Name | Conditions | Score | Metric | Source |
|---|---|---|---|---|
| SWE-Atlas Codebase QnA | harness: Codex | 32.6 | score | Source ↗ |
| SWE-Atlas Refactoring | harness: Codex | 42.38 | score | Source ↗ |
| SWE-Atlas Test Writing | harness: Codex | 38.98 | score | Source ↗ |
The same benchmark scores very differently across harness / dataset, so the qualifying conditions must be shown together.
Reasoning control
effort = noneeffort = loweffort = mediumeffort = higheffort = maxbudget_tokenseffort = xhigheffort = minimal
3 / 27 providers expose no reasoning control (reasoning_options: []).
Related models
GPT-5.3 Codex (OpenAI)same series$1.75 / $14.00GPT-5.3 Codex (Azure)same series$1.75 / $14.00OpenAI GPT-5.3 Codexsame series$1.75 / $14.00GLM-5.2cheaper alternative$1.40 / $4.40Kimi K2.6cheaper alternative$0.95 / $4.00DeepSeek V4 Procheaper alternative$0.435 / $0.87DeepSeek V4 Flashcheaper alternative$0.14 / $0.28
Price historyone sample accumulated per data sync
Input listOutput listMin blended