Highest-accuracy GPT-5.5 tier for slower, precision-heavy reasoning and coding
GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. It features a 1M+ token context window (922K input, 128K output) with support for...
Context
1.05M
1,050,000 tokens
Max output
128K
128,000 tokens
Input
$30.00
per 1M tokens
Output
$180
per 1M tokens
Providers
20
20 listings
Intelligence
—
Not yet scored
Pricing
USD per 1M tokens · listed by OpenAI
| Token type | Standard | Over 200K context |
|---|---|---|
| Input | $30.00 | $60.00 |
| Output | $180 | $270 |
Above 272K context: $60.00 in, $270 out. Lowest input price across providers: $27.27.
Capabilities
Effort: medium, high, xhigh
Field: reasoning_details
Input
Output
Benchmarks
Published scores and Design Arena Elo
No published benchmark scores for this model yet.
Rankings
Position on each OneAtlas leaderboard
Providers · 20
20 listings
OpenAI
LLM Gateway
Vercel AI Gateway
Kilo Gateway
Eden AI
DevPass (LLM Gateway)Requesty
AI/ML API
AIHubMix
Poe
OpenCode
Venice AI
OrcaRouter
ZenMux
Impossibl
Cloudflare AI Gateway
CrossModel
Neon
Opper
FastRouter| Provider | Model ID | Context | Input limit | Output | Input $ | Output $ | Reasoning $ | Cache read | Cache write | Audio in | Audio out | Reasoning | Tools | Structured | Temp. | Updated |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AI/ML API | openai/gpt-5.5-pro | 1.05M | 922K | 128K | $31.74 | $190 | — | — | — | — | — | Yes | Yes | Yes | No | Apr 23, 2026 |
| AIHubMix | gpt-5.5-pro | 1.05M | 922K | 128K | $30.00 | $180 | — | — | — | — | — | Yes | Yes | Yes | No | Apr 23, 2026 |
| Cloudflare AI Gateway | openai/gpt-5.5-pro | 1M | 922K | 128K | $30.00 | $180 | — | — | — | — | — | Yes | Yes | Yes | No | Apr 23, 2026 |
| CrossModel | openai/gpt-5.5-pro | 1.05M | 922K | 128K | $30.00 | $180 | — | — | — | — | — | Yes | Yes | Yes | No | Apr 23, 2026 |
| DevPass (LLM Gateway) | gpt-5.5-pro | 1.05M | 922K | 128K | $30.00 | $180 | — | — | — | — | — | Yes | Yes | Yes | No | Apr 23, 2026 |
| Eden AI | openai/gpt-5.5-pro | 1.05M | 922K | 128K | $30.00 | $180 | — | — | — | — | — | Yes | Yes | Yes | No | Apr 23, 2026 |
| FastRouter | openai/gpt-5.5-pro | 1.05M | 922K | 128K | $30.00 | $180 | — | — | — | — | — | Yes | Yes | Yes | No | Apr 23, 2026 |
| Impossibl | openai/gpt-5.5-pro | 1.05M | 922K | 128K | $30.00 | $180 | — | $3.00 | — | — | — | Yes | Yes | Yes | No | Apr 23, 2026 |
| Kilo Gateway | openai/gpt-5.5-pro | 1.05M | 922K | 128K | $30.00 | $180 | — | — | — | — | — | Yes | Yes | Yes | No | Apr 23, 2026 |
| LLM Gateway | openai/gpt-5.5-pro | 1.05M | 922K | 128K | $30.00 | $180 | — | — | — | — | — | Yes | Yes | No | No | Apr 23, 2026 |
| Neon | gpt-5-5-pro | 1.05M | 922K | 128K | $30.00 | $180 | — | — | — | — | — | Yes | Yes | Yes | No | Apr 23, 2026 |
| OpenAI | gpt-5.5-pro | 1.05M | 922K | 128K | $30.00 | $180 | — | — | — | — | — | Yes | Yes | Yes | No | Apr 23, 2026 |
| OpenCode | gpt-5.5-pro | 1.05M | 922K | 128K | $30.00 | $180 | — | $30.00 | — | — | — | Yes | Yes | No | No | Apr 23, 2026 |
| Opper | gpt-5.5-pro | 1.05M | 922K | 128K | $30.00 | $180 | — | — | — | — | — | Yes | Yes | Yes | No | Apr 23, 2026 |
| OrcaRouter | openai/gpt-5.5-pro | 1.05M | 922K | 100K | $30.00 | $180 | — | — | — | — | — | Yes | Yes | Yes | No | Apr 23, 2026 |
| Poe | openai/gpt-5.5-pro | 400K | 922K | 128K | $27.27 | $164 | — | — | — | — | — | Yes | Yes | No | No | Apr 23, 2026 |
| Requesty | gpt-5.5-pro | 1.05M | 922K | 128K | $30.00 | $180 | — | — | — | — | — | Yes | Yes | Yes | No | Apr 23, 2026 |
| Venice AI | openai-gpt-55-pro | 1M | 922K | 128K | $30.00 | $180 | — | — | — | — | — | Yes | Yes | Yes | No | Apr 23, 2026 |
| Vercel AI Gateway | openai/gpt-5.5-pro | 1M | 872K | 128K | $30.00 | $180 | — | — | — | — | — | Yes | Yes | Yes | Yes | Apr 23, 2026 |
| ZenMux | openai/gpt-5.5-pro | 1.05M | 922K | 128K | $30.00 | $180 | — | — | — | — | — | Yes | Yes | Yes | No | Apr 23, 2026 |