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o3 (Fast)
openai·openai/o3-fast·GA·Closed·o series
Deliberate o-series reasoner for hard math, coding, and multi-step analysis
At a glance
Reference price$3.50 / $14.00 per 1M
Cache read $0.875 · Vercel AI Gateway
Lowest paid$3.50 / $14.00
Vercel AI Gateway Cloud
Context200,000
Output limit100,000
Capabilities
✓ Reasoning✓ Tool use✓ Structured outputTemperature✓ Attachments
Modalities
TextImagePDF
Knowledge cutoff2024-05
Released / updated2025-04-16 / 2025-04-16
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 | $14.00 | $0.875 | — | 200,000 | 100,000 |
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$1,085.00
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 = high
Related models
S2.1 Pro (Free)same series—S2.1 Prosame series—Arrow 1.1same series—GLM-5.2cheaper alternative$1.40 / $4.40GPT OSS 120Bcheaper alternative$1.00 / $4.20Kimi K2.6cheaper alternative$0.95 / $4.00DeepSeek V4 Procheaper alternative$0.435 / $0.87
Price historyone sample accumulated per data sync
Input list $3.50Output list $14.00Min blended $6.13
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.