GPT-5.5 API pricing
OpenAI model · OpenAI on AIWiseRank
Short answer
GPT-5.5 by OpenAI costs $5 per 1M input tokens and $30 per 1M output tokens, with a 1.05M token context window. It scores 82.6% on SWE-bench Verified and 85% on ARC-AGI-2. GLM-5.3 Flash scores about as well on SWE-bench Verified (92%) for $0.24 per 1M blended tokens versus $11.25.
Prices updated Oct 23, 2026 (APIpulse, CC BY 4.0) · Benchmarks: ARC Prize, Vals.ai · all models
API cost calculator
Enter your monthly usage in millions of tokens (1M tokens ≈ 750,000 words).
Standard rates; batch processing and prompt caching can lower the bill.
Benchmarks
Cheaper models with similar scores
Within 3 points on the same benchmark, at a lower blended price.
- GLM-5.3 FlashSWE-bench Verified 92% · $0.24 / 1M
- GPT-5.6 LunaSWE-bench Verified 93% · $0.45 / 1M
- DeepSeek V4 ProSWE-bench Verified 96.4% · $0.99 / 1M
Other OpenAI models
| Model | Input / 1M | Output / 1M |
|---|---|---|
| GPT-6.1 Sol | $2 | $10 |
| GPT-6 Astra | $10 | $50 |
| GPT-6 Sol | $2 | $10 |
| GPT-6 Luna | $0.10 | $0.50 |
| GPT-5.6 Cyber | $12.50 | $75 |
| GPT-5.6 Sol | $4 | $20 |
| GPT-5.6 Terra | $2 | $12 |
| GPT-5.6 Luna | $0.20 | $1.20 |
Frequently asked questions
How much does the GPT-5.5 API cost?
GPT-5.5 costs $5 per 1M input tokens and $30 per 1M output tokens. A workload of 10M input and 2M output tokens a month costs $110.
What is the context window of GPT-5.5?
GPT-5.5 supports a 1.05M token context window.
Is there a cheaper alternative to GPT-5.5?
GLM-5.3 Flash scores 92% on SWE-bench Verified, close to GPT-5.5, at $0.24 per 1M blended tokens versus $11.25.