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GPT 5.1 Thinking (Fast)
openai·openai/gpt-5.1-thinking-fast·GA·Closed·gpt series
Compact GPT model for low-latency assistance and high-volume workloads
At a glance
Reference price$2.50 / $20.00 per 1M
Cache read $0.25 · Vercel AI Gateway
Lowest paid$2.50 / $20.00
Vercel AI Gateway Cloud
Context400,000
Output limit128,000
Capabilities
✓ Reasoning✓ Tool use? Structured output? Temperature✓ Attachments
Modalities
TextImagePDF
Knowledge cutoff—
Released / updated2025-11-12 / 2025-11-12
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 | $2.50 | $20.00 | $0.25 | — | 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$1,230.00
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
Upstream provides no control info
1 / 1 providers expose no reasoning control (reasoning_options: []).
Related models
RouteLLMsame series$3.00 / $15.00GPT-Realtime-2.1same series$4.00 / $24.00NanoGPT Helpsame series$0 / $0GLM-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 $2.50Output list $20.00Min blended $6.88
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.