AI Model Watch
Models / OpenAI

GPT-5.5 Pro

GA

Snapshot alias gpt-5.5-pro-2026-04-23. Responses API only (incl. Batch); long-running, background mode recommended. Reasoning effort medium/high/xhigh. No cached-input price published. Regional data-residency endpoints add ~10% surcharge.

Provider
OpenAI
Status
GA
Input price
$30 / 1M tokens
Output price
$180 / 1M tokens
Cached input
—
Blended price
$67.50 / 1M tokens
Context window
1,050,000 tokens (1.1M)
Max output
128,000 tokens
Modality
text, image
Knowledge cutoff
2025-12-01
Released
23 Apr 2026
API string
gpt-5.5-pro

Source: OpenAI official documentation ↗

See also

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