One agent session
1M input tokens and 100K output tokens, no caching.
- Input1M x $5 = $5.00
- Output0.1M x $30 = $3.00
$8.00per session
OpenAI - Closed weights
GPT-5.5 pricing and specs
GPT-5.5 is a closed-weights model from OpenAI that costs $5 per 1M input tokens and $30 per 1M output tokens on the first-party API, with a 1.05M-token context window.
Last verified from developers.openai.com. All sources
- Input / 1M
- $5
- Output / 1M
- $30
- Context
- 1.05M tokens
- Weights
- Closed
Pricing per 1M tokens
| Item | Price / 1M tokens |
|---|---|
| InputPrompts up to 272,000 tokens | $5 |
| OutputPrompts up to 272,000 tokens | $30 |
| Cache readPrompts up to 272,000 tokens | $0.50 |
| Batch inputBatch requests, prompts up to 272,000 tokens | $2.50 |
| Batch outputBatch requests, prompts up to 272,000 tokens | $15 |
| Long-context inputPrompts over 272,000 tokens | $10 |
| Long-context outputPrompts over 272,000 tokens | $45 |
| Long-context cache readPrompts over 272,000 tokens | $1 |
| Long-context batch inputBatch requests, prompts over 272,000 tokens | $5 |
| Long-context batch outputBatch requests, prompts over 272,000 tokens | $22.50 |
| Fast mode inputFast mode requests | $12.50 |
| Fast mode outputFast mode requests | $75 |
Note: Priced by prompt length: a request with more than 272K input tokens pays the long-context pricing rates for the whole request (short context is <=272K input tokens). No separate cache-write price is listed. Caching for GPT-5.5 only works with extended prompt caching (changelog 2026-04-24). Fast mode has no long-context price listed. Regional processing adds 10%. Default snapshot gpt-5.5-2026-04-23.
Specs
- Context window
- 1,050,000 tokens
- Max output
- 128,000 tokens
- Release date
- Provider
- OpenAI
- API model id
gpt-5.5- Vercel AI Gateway id
openai/gpt-5.5- Weights
- Closed weights
What GPT-5.5 costs in practice
Worked from the standard list rates above, with the math shown so you can swap in your own token counts. These use the base rates, which apply while each request's prompt stays at or under 272,000 tokens; above that, GPT-5.5 bills $10 input and $45 output for the whole request.
A chat app
10,000 requests a day at 2K input and 500 output tokens each.
- Input20M x $5 = $100.00
- Output5M x $30 = $150.00
$250.00per day
$7,500.00 per 30-day month
The same session at a 90% cache hit
90% of the input is read from the prompt cache. The one-time cache write premium is not included.
- Cached input0.9M x $0.50 = $0.45
- Uncached input0.1M x $5 = $0.50
- Output0.1M x $30 = $3.00
$3.95per session
Compare with
| Model | Input / 1M | Output / 1M |
|---|---|---|
| GPT-5.5 (this page) | $5 | $30 |
| Chat LatestOpenAI | $5 | $30 |
| GPT-4 TurboOpenAI | $10 | $30 |
| Claude Opus 4.5Anthropic | $5 | $25 |
| Claude Opus 4.6Anthropic | $5 | $25 |
| GPT-5.6 SolOpenAI | $4 | $20 |
| GPT-5.4OpenAI | $2.50 | $15 |
| GPT-5.2OpenAI | $1.75 | $14 |
| GPT-5.3-CodexOpenAI | $1.75 | $14 |
Compare
Side-by-side pages with both models' prices, specs, cost examples and like-for-like benchmark rows.
Related reading
- Codex 'gpt-5.5 Model Is Not Supported' Error: The FixCodex says gpt-5.5 is not supported with a ChatGPT account because OpenAI retired it from ChatGPT sign-in on October 14. The fix and what still works.
- GLM 5.2 in 9 Minutes: The Open-Weight Rival to GPT-5.5GLM 5.2 in 9 minutes: a companion guide to the video on the open-weight GPT-5.5 rival, covering benchmarks, pricing and a live OpenCode demo.
- GPT-5.5 in 7 Minutes: Benchmarks, Codex Agents, Context Window, and PricingGPT-5.5 in 7 minutes: a companion guide to the video review of the new OpenAI model in ChatGPT and Codex - benchmarks, Codex agents, context window and pricing.
- GPT-5.5 Has a 3x Higher Hallucination Rate Than MIT-Licensed GLM-5.2GPT-5.5 hallucinates 86% of the time on AA-Omniscience when it does not know, versus 28% for MIT-licensed GLM-5.2. What the metric measures and why it matters.
- Best Claude Model Now That Fable 5 Is Disabled (Mythos vs Opus vs GPT-5.5)Fable 5 and Mythos 5 are gone for now. Here is the honest ranking of what to use today, from Opus 4.8 to GPT-5.5 to open-weight models, by task.
- GPT-5.6 Sol vs Claude Opus 5: The $5 Workhorse Head-to-HeadGPT-5.6 Sol vs Claude Opus 5: both cost $5 per million input tokens, so the workhorse-tier decision comes down to output pricing, benchmarks, and tooling.
FAQ
How much does GPT-5.5 cost per million tokens?
GPT-5.5 costs $5 per 1M input tokens and $30 per 1M output tokens on OpenAI's first-party API, per developers.openai.com on October 17, 2026. Per 1M tokens, cache reads cost $0.50, and the batch rate is $2.50 input and $15 output. Prompts over 272,000 tokens are billed at $10 input and $45 output for the whole request.
What is GPT-5.5's context window?
GPT-5.5 has a 1,050,000-token context window and returns up to 128,000 output tokens per response.
Are GPT-5.5's weights open?
No. GPT-5.5 is a closed-weights model. You call it through OpenAI's API as gpt-5.5 or through Vercel AI Gateway as openai/gpt-5.5.
When was GPT-5.5 released?
OpenAI released GPT-5.5 on April 24, 2026.
Sources
Last verified from developers.openai.com.
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