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GPT 5.3 Codex (Fast)
openai·openai/gpt-5.3-codex-fast·GA·Closed·gpt-codex series
Coding-optimized GPT model for repository edits, reviews, and agentic software work
At a glance
Reference price$3.50 / $28.00 per 1M
Cache read $0.35 · Vercel AI Gateway
Lowest paid$3.50 / $28.00
Vercel AI Gateway Cloud
Context400,000
Output limit128,000
Capabilities
✓ Reasoning✓ Tool use✓ Structured outputTemperature✓ Attachments
Modalities
TextImagePDF
Knowledge cutoff2025-08-31
Released / updated2026-02-05 / 2026-02-05
Quality & performance
Artificial Analysis doesn't cover this model (267 of 2059 have data). Quality data comes from independent evals covering widely used models.
Available at 1 providers1 with public prices
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| Vercel AI Gateway | Cloud | $3.50 | $28.00 | $0.35 | — | 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
1Vercel AI Gateway$1,722.00
The cheapest paid channel is the only channel.
Benchmark
No upstream benchmark data for this model. For quality, see the Artificial Analysis intelligence score above.
Reasoning control
effort = loweffort = mediumeffort = higheffort = xhigh
Related models
GPT-5.3 Codexsame series$1.75 / $14.00GPT-5.3 Codex (OpenAI)same series$1.75 / $14.00GPT-5.3 Codex (Azure)same 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 list $3.50Output list $28.00Min blended $9.63
Price history accumulates from each data sync; currently only 1 sample(s) (2026-08-19). Each future sync adds a point, and once accumulated a line is drawn here.