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Models / OpenAI

GPT-5.5

GA

Prior flagship, still GA — superseded as OpenAI's top tier by GPT-5.6 Sol (2026-07-09) at the same $5/$0.50/$30 price. Snapshot alias gpt-5.5-2026-04-23 (snapshot date taken as release date). Text input / text output, configurable reasoning effort. Pricing from developers.openai.com/api/docs/pricing (standard tier); batch tier is ~50% ($2.50/$0.25/$15.00). OpenAI's pricing page qualifies this rate as "<272K context length" (verified 2026-08-08); it publishes no rate above that band on this surface.

GPT-5.5 by OpenAI costs $5 per 1M input tokens and $30 per 1M output tokens ($11.25/1M blended), with a 1.1M (1.050.000-token) context window. It is generally available (GA), with a knowledge cutoff of 1 Dec 2025.

Last verified: 13 Aug 2026 · sourced from official provider documentation

Provider
OpenAI
Status
GA
Input price
$5 / 1M tokens
Output price
$30 / 1M tokens
Cached input
$0.5 / 1M tokens
Blended price
$11.25 / 1M tokens
Context window
1.050.000 tokens (1.1M)
Max output
128.000 tokens
Modality
text, image
Open weights
No — API only
Knowledge cutoff
2025-12-01
Released
23 Apr 2026
API string
gpt-5.5

Source: OpenAI official documentation ↗

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FAQ

GPT-5.5 — questions & answers

How much does GPT-5.5 cost?

GPT-5.5 is priced at $5 per 1M input tokens and $30 per 1M output tokens ($11.25/1M blended at a 3:1 input-to-output ratio), with cached input at $0.5 per 1M tokens.

What is the context window of GPT-5.5?

GPT-5.5 has a 1.050.000-token context window (1.1M), with up to 128.000 output tokens per request.

Is GPT-5.5 deprecated?

No — GPT-5.5 is generally available (GA) and not currently scheduled for deprecation or retirement in our tracker.

Does GPT-5.5 support image or vision input?

Yes — GPT-5.5 accepts image input. Listed modalities: text, image.

Can I self-host GPT-5.5?

No — GPT-5.5 is proprietary. Its weights are not publicly released, so it is available only through OpenAI's API (or hosted partners), not for self-hosting.

What is the API model string for GPT-5.5?

The API model identifier for GPT-5.5 is "gpt-5.5" when calling OpenAI's API.

What is GPT-5.5's knowledge cutoff?

GPT-5.5's training knowledge cutoff is 1 Dec 2025.