GPT-5.5 Pro
openai/gpt-5-5-proBy OpenAI · family: gpt-pro · released 2026-04-23 · knowledge: 2025-12-01
Prices in USD per 1M tokens. Unknown means the provider does not publish per-token pricing.
Capabilities
Model fit scores
0–100 · higher is betterThese scores reward declared capabilities, context size, price and provider availability — they are not benchmark results. Use them as a directional signal alongside your own evaluation.
Coding98
- Tool calling40/40
- Structured output20/20
- Reasoning10/10
- Context window (100K → 1M)20/20
- Provider availability8/10
Agents98
- Tool calling35/35
- Structured output25/25
- Reasoning15/15
- Output token limit15/15
- Provider availability8/10
JSON / structured output70
- Structured output / JSON mode50/50
- Tool calling20/20
- Temperature control0/10
- Price-friendly for high-volume0/20
Cost efficiency5
- Headline price (log-scaled)5/95
- Has prompt-cache pricing0/5
Long context91
- Context window (100K → 2M)81/90
- Has published price for full window10/10
Vision98
- Accepts image input50/50
- Context window (10K → 1M)30/30
- Has published price10/10
- Provider availability8/10
Production-readiness94
- Number of independent providers40/40
- Has published per-token price20/20
- Context window ≥ 8K15/15
- No data inconsistencies across providers4/10
- Official model (not derivative)15/15
Cost Efficiency Index
Open full calculator →Estimated cost using the recommended provider's headline rate. Each scenario fixes average input/output tokens — the assumptions are shown in the third column.
| Scenario | Cost | Assumption |
|---|---|---|
RAG answer per 1,000 RAG answers | $240 $0.24 per request | 5K input tokens (query + 4 retrieved chunks of ~1K each) and a 500-token answer. Typical SaaS knowledge-base bot. |
Support ticket triage per 10,000 tickets | $480 $0.05 per request | 1K input tokens (ticket body + system prompt) and a 100-token JSON classification reply. High-volume customer support. |
Data extraction per 1,000 documents | $150 $0.15 per request | 2K input tokens (a single document page) and a 500-token JSON extraction. ETL / invoice / form pipelines. |
Code review per 1,000 PRs | $420 $0.42 per request | 8K input tokens (diff + surrounding files) and a 1K-token review comment. PR-bot workloads. |
Agent step per 1,000 steps | $468 $0.47 per request | 12K input tokens (long-running tool history) and a 600-token tool-call decision. Cost per agent step. |
Pricing detail
Recommended pricing from openai · gpt-5.5-pro
Cheapest provider: poe · $27.27 input + $163.64 output
Available on 8 providers
| Provider | Provider model id | Input / 1M | Output / 1M | Context | Released |
|---|---|---|---|---|---|
| OpenAI openai | gpt-5.5-pro | $30.00 | $180.00 | 1.05M | 2026-04-23 |
| OpenRouter openrouter | openai/gpt-5.5-pro | $30.00 | $180.00 | 1.05M | 2026-04-23 |
| Vercel AI Gateway vercel | openai/gpt-5.5-pro | $30.00 | $180.00 | 1M | 2026-04-24 |
| ZenMux zenmux | openai/gpt-5.5-pro | $30.00 | $180.00 | 1.05M | 2026-04-23 |
| Kilo Gateway kilo | openai/gpt-5.5-pro | $30.00 | $180.00 | 1.05M | 2026-04-24 |
| OpenCode Zen opencode | gpt-5.5-pro | $30.00 | $180.00 | 1.05M | 2026-04-24 |
| Poe poe | openai/gpt-5.5-pro | $27.27 | $163.64 | 400K | 2026-04-08 |
| LLM Gateway llmgateway | gpt-5.5-pro | $30.00 | $180.00 | 1.05M | 2026-04-23 |
Data inconsistencies across providers
- context_window varies: 1000000, 1050000, 400000
- release_date varies (span 16d): 2026-04-08, 2026-04-23, 2026-04-24
- modalities varies across offerings
Different providers report different values for this model. Quick facts above use the representative provider; consult the table for per-provider truth.
Frequently asked questions
How much does GPT-5.5 Pro cost?
GPT-5.5 Pro costs $30.00 per 1M input tokens and $180.00 per 1M output tokens, sourced from openai. Cache reads, audio tokens and >200K-context tiers (where applicable) are listed in the Pricing detail block above.
What is the context window of GPT-5.5 Pro?
GPT-5.5 Pro has a context window of 1.05M tokens, with a max output of 128K tokens per reply. This is the total combined size of prompt + completion.
Does GPT-5.5 Pro support tool calling?
Yes. GPT-5.5 Pro supports tool calling (function calling). This makes it suitable for production agent and automation workloads where the model has to invoke external functions reliably.
Does GPT-5.5 Pro support structured output / JSON mode?
Yes. GPT-5.5 Pro supports structured output / JSON-schema-constrained decoding. This makes it suitable for production agent and automation workloads where the model has to invoke external functions reliably.
Can GPT-5.5 Pro accept image input?
Yes. GPT-5.5 Pro accepts both text and image input. Vision pricing per image is usually billed on top of the regular token rate — check OpenAI's docs for the exact rule.
Is GPT-5.5 Pro open-weight?
No. GPT-5.5 Pro is a proprietary model — only OpenAI (and any approved hosting partners) can serve it. The pricing above reflects the cheapest API access.
What are the best alternatives to GPT-5.5 Pro?
If GPT-5.5 Pro doesn't fit, consider GPT OSS 120B, GPT OSS 20B, GPT-5.2. Each one targets the same use case — see the Related links below for direct head-to-head pages.
Where does this data come from?
All numbers come from the public models.dev API and are normalised into a single canonical model record. We re-pull daily and write any changes (price, context, capability) to the /changelog page.
Explore more
More OpenAI models
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- GPT-5$1.25 in / $10.00 out
Capability lists this model is in
Last updated:
Data is sourced from models.dev and normalized for comparison. Prices and capabilities may change. Always verify critical production decisions with the provider's official documentation.