GPT-5.5 Pricing
OpenAI · GPT-5 · Live
GPT-5.5 costs $5 per million input tokens and $30 per million output tokens on the OpenAI API. Cached input reads are billed at $0.5 per million tokens. It supports a 1,050,000-token context window and up to 128,000 output tokens per request. The model supports extended reasoning, image input, tool use. Pricing verified July 29, 2026.
GPT-5.5 API pricing
- Input (per 1M tokens)
- $5
- Output (per 1M tokens)
- $30
- Cached input (per 1M tokens)
- $0.5
- Batch discount
- 50%
- Context window
- 1,050,000 tokens
- Max output
- 128,000 tokens
Capabilities
Price history
Price-stable since July 20, 2026.
Frequently asked questions
Notes
Current OpenAI flagship (April 23, 2026 release). Pricing doubled from prior GPT-5 line ($2.50/$15 → $5/$30) per OpenAI's release announcement. Cache Write 5m/1h N/A — OpenAI uses automatic prompt caching with no separate write cost (cached input billed at $0.50/MTok). Batch API: 50% off. US-only inference: 10% uplift per data-residency pricing. Verified via openai.com/api/pricing on May 28, 2026. [2026-07-20] Context Window 400,000 → 1,050,000 and Max Output 16,384 → 128,000 per developers.openai.com GPT-5.5 model page (corroborated by aggregators citing "1M context"). Prices unchanged ($5/$30, cache read $0.50). NOTE: prompts >272K input tokens bill at 2× input / 1.5× output for the full session — calculator may need a long-context tier.