Availability

Publicly available

Provider

OpenAI

Country

USA

Family

GPT

Status

Current

Weights

Closed

Release date

2026-04-24T00:00:00.000Z

Modalities

text (both)

Input per million tokens

30 USD

Output per million tokens

180 USD

Price effective from

2026-09-25T00:00:00.000Z

Knowledge cutoff

2025-12-01T00:00:00.000Z

Aliases

gpt-5.5-pro, gpt-5.5-pro-2026-04-23

Capabilities

• reasoning · primary
• tool_use
• structured_output

Traits

• context_window1,050,000 tokens
• max_output_tokens128,000 tokens

Reasoning

• GPQA Diamond94.4 percent

  accuracy · higher is better · 2026-04-23T00:00:00.000ZSource