GPT-5.5 Pro
by OpenAIChat
Highest-accuracy GPT-5.5 tier for slower, precision-heavy reasoning and coding
- Context
- 1.05M tokens
- Max output
- 128,000 tokens
- Released
- 2026-04-23
- Weights
- Closed
openai/gpt-5-5-pro · also seen as openai-gpt-55-pro, gpt-5.5-pro-2026-04-23, databricks-gpt-5-5-pro, openai/gpt-5.5-pro-20260423, +1 more
Specifications
Full facts as recorded, incl. what is unknown.
- Released
- 2026-04-23
- Weights
- Closed
- Input
- Text, Image, PDF
- Output
- Text
- Context window
- 1,050,000 max across endpoints
- Max output
- 128,000
- Providers
- 6 + 17 gateways, not counted as providers
- Epoch Capabilities Index
- 162 ± 3.1 against price
- Direct price range
- $30.00–$41.26 in · $180.00–$247.57 out per 1M tokens · across all 6 providers
More details
- Last updated
- 2026-06-11
- Knowledge cutoff
- 2025-12-01
- Developer country
- United States of America
Capabilities
Across all endpoints: supported if any endpoint supports it.
- Tool calling
- Parallel tools
- Structured output
- Reasoning
- Image input
- PDF input
- Audio input
- Audio outputunknown
- Video input
- Prompt caching
- Web search
- Computer useunknown
- System messages
- Assistant prefillunknown
- Temperature
- Streaming
- Attachments
Endpoints
One row per provider and variant; gateways are listed separately.
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Price history
Atom feedNo change since 19 Oct 2026. The cheapest direct price has been $30 in / $180 out per 1M tokens at OpenAI on every data refresh since then.
Tracked from 19 Oct 2026. Headline-eligible direct prices only, so a price the sanity check flags never draws a spike. Series as JSON
Cost calculator
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Similarly priced models
Blended rate per 1M tokens, each at its own cheapest provider (10M input : 2M output mix).
| Model | Blended/1M | In/1M | Out/1M | Context | vs GPT-5.5 Pro |
|---|---|---|---|---|---|
| GPT-5.4 ProOpenAI | $55 | $30 | $180 | 1.05M | +0% |
| GPT-5.2 ProOpenAI | $40.95 | $18.90 | $151.20 | 400K | −26% cheaper |
| GPT-4OpenAI | $35 | $30 | $60 | 8.2K | −36% cheaper |
| GPT-6 Astra (Fast)OpenAI | $33.33 | $20 | $100 | 1.05M | −39% cheaper |
| o3-proOpenAI | $30 | $20 | $80 | 200K | −45% cheaper |
| GPT-5 ProOpenAI | $29.25 | $13.50 | $108 | 400K | −47% cheaper |
| Claude Opus 3Anthropic | $25 | $15 | $75 | 200K | −55% cheaper |
| Claude Opus 4Anthropic | $22.50 | $13.50 | $67.50 | 200K | −59% cheaper |
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