OpenAI: GPT-5.5
Vendor: openai|
gpt-5.5Modalities
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In / out price96% off96% cheaper than the provider's official price per 1M tokens.
$0.188 / $0.188 per 1M
Context
400K
Released
Apr 23, 2026
Overview
OpenAI's spring 2026 flagship: the most agentic model in the lineup at launch, 82.7% on Terminal-Bench 2.0, strong at computer use and knowledge work. Same speed per token as GPT-5.4, but it spends fewer tokens on equivalent Codex tasks.
Context
400K
Max output
128 000
Released
Apr 23, 2026
Step-by-step reasoning
Yes
Agents
Price per 1M tokens
Input and output cost the same, billed per actual usage — no subscriptions, no minimums.
Input
$0.188/M
$5.00/M96% off96% cheaper than the provider's official price per 1M tokens.
Output
$0.188/M
$30.00/M99% off99% cheaper than the provider's official price per 1M tokens.
Official list price: $5.00 / $30.00 per 1M
Performance
Gateway metrics for the last 24 hours.
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FAQ
Are there any rate limits?
The default limit is request rate per key. Each key can be restricted by models, spend and IP in your dashboard.
How is billing calculated?
Pay as you go: one price per 1M tokens, input and output cost the same, charged proportionally to real usage.
Is streaming supported?
Yes, stream: true behaves exactly like in the OpenAI API — tokens arrive as they are generated.