LLM Toolkit Model profile · OpenAI
GPT-5.5 pricing
GPT-5.5 costs $5.00 per 1M input tokens and $30.00 per 1M output tokens, with a 400K context window. Rates verified against the official OpenAI pricing page as of 2026-08-26.
Input
$5.00 /1M in
cached: $0.50
Output
$30.00 /1M out
6.0× the input rate
Context window
400K tokens
≈ 300,000 words
GPT-5.5 at a glance
| Input / 1M tokens | $5.00 |
| Cached input / 1M | $0.50 |
| Output / 1M tokens | $30.00 |
| Context window | 400K tokens |
| ≈ English words of context | 300,000 |
| Provider | OpenAI |
| Price verified | 2026-08-26 |
Source: OpenAI official pricing page. We re-verify every model monthly.
What GPT-5.5 costs per month
| Workload | GPT-5.5 monthly cost | Per request |
|---|---|---|
| Side-project chatbot 30K req · 2,000 in · 500 out · 40% cached | $642.00/mo | $0.021 |
| Coding agent 500K req · 12,000 in · 1,500 out · 70% cached | $33,600/mo | $0.067 |
| Bulk extraction 2,000K req · 800 in · 120 out · 20% cached | $13,760/mo | $0.0069 |
Computed from list prices verified 2026-08-26. Cache savings blend normal and cached input rates by the hit rate. Compare against every other model at your exact volumes on the API Cost Calculator.
How much context is 400K tokens?
About 300,000 English words — roughly 600 pages of text — or several large codebases. Filling the entire window once costs $2.00 in input tokens at list price, before the model generates a single output token. Count your real documents with the AI Token Counter.
Frequently asked questions
How much does GPT-5.5 cost per million tokens?
GPT-5.5 costs $5.00 per 1M input tokens and $30.00 per 1M output tokens, with cached input at $0.50. Rates are verified against OpenAI's official pricing page as of 2026-08-26.
How big is GPT-5.5's context window?
GPT-5.5 ships a 400K token context window — roughly 300,000 English words, or about 600 pages of text. Filling the entire window once costs $2.00 in input tokens at list price.
Is GPT-5.5 cheap or expensive compared to other models?
Among the 22 models we track, GPT-5.5 ranks #20 on input price — cheapest is GPT-5 nano at $0.05, priciest is Claude Fable 5 at $10.00. At $5.00 per 1M input, GPT-5.5 runs 100.0× the cheapest tier. Compare it head-to-head with its rivals on the model comparison pages.
What is cached input pricing on GPT-5.5?
GPT-5.5 charges $0.50 per 1M cached input tokens — 10% of its $5.00 base input rate. If your requests repeat context (system prompts, documents, conversation history), prompt caching cuts the input portion of your bill accordingly. Model the exact savings on the API Cost Calculator.
More OpenAI models
- GPT-5.6 Sol $4.00 in · 400K
- GPT-5.6 Terra $2.00 in · 400K
- GPT-5.6 Luna $0.20 in · 400K
- GPT-5.4 $2.50 in · 400K
- GPT-5.4 mini $0.75 in · 400K
- GPT-5.4 nano $0.20 in · 400K
- GPT-5.2 $1.75 in · 400K
- GPT-5 $1.25 in · 400K
Or see all rates on the Pricing Comparison.