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GPT 5.5 (Fast)
openai·openai/gpt-5.5-fast·GA·Closed·gpt series
Default frontier GPT for coding, computer use, research, and knowledge work
At a glance
Reference price$12.50 / $75.00 per 1M
Cache read $1.25 · Vercel AI Gateway
Lowest paid$12.50 / $75.00
Vercel AI Gateway Cloud
Context1,000,000
Output limit128,000
Capabilities
✓ Reasoning✓ Tool use✓ Structured outputTemperature✓ Attachments
Modalities
TextImagePDF
Knowledge cutoff2025-12-01
Released / updated2026-04-23 / 2026-04-23
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 | $12.50 | $75.00 | $1.25 | — | 1,000,000 | 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$4,900.00
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 = noneeffort = loweffort = mediumeffort = higheffort = xhigh
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 / $4.40DeepSeek V4 Procheaper alternative$0.435 / $0.87DeepSeek V4 Flashcheaper alternative$0.14 / $0.28Kimi K3cheaper alternative$3.00 / $15.00
Price historyone sample accumulated per data sync
Input list $12.50Output list $75.00Min blended $28.13
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.