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OpenAIGPT-5.1 Chat API pricing

Generally available November 13, 2025 source
Deprecated April 22, 2026 source
Retired July 23, 2026 source

GPT-5.1 Chat was retired on July 23, 2026. Its last price was $1.25 per 1M input tokens and $10.00 per 1M output tokens.

Last price

Rates in effect since November 13, 2025 (launch price). Every price links to its source.

Input: $1.25
Output: $10.00
Blended 3:1: $3.4375

GPT-5.1 Chat last rates per 1M tokens
Rate	Per 1M tokens
Input	$1.25
Cached input	$0.125
Output	$10.00

Launch price

GPT-5.1 Chat launched at this price on November 13, 2025.

Input: $1.25
Output: $10.00
Blended 3:1: $3.4375

Every price event

1 verified event, newest first. No price moves. Documented since November 13, 2025.

Launch price · November 13, 2025

Rates from November 13, 2025
Rate Per 1M tokens

Input $1.25
Cached input $0.125
Output $10.00

The launch post prices it by reference ('the same as GPT‑5'); GPT-5's price that day is from the 2025-11-13 pricing-page capture. The GPT-5.2 post (2025-12-11) and the 2025-12-11 platform pricing capture list gpt-5.1-chat-latest at $1.25 / $0.125 / $10 explicitly.
- Price: Archived page (openai.com, captured November 13, 2025)
  quote
  GPT‑5.1 and gpt-5.1-chat-latest are available to developers on all paid tiers in the API. Pricing and rate limits are the same as GPT‑5.
- Price: Archived page (openai.com, captured November 13, 2025)
  quote
  GPT-5 | The best model for coding and agentic tasks across industries | Price | Input: | $1.250 / 1M tokens | Cached input: | $0.125 / 1M tokens | Output: | $10.000 / 1M tokens
- Price: Archived page (openai.com, captured December 11, 2025)
  quote
  Price per million tokens Model Input Cached input Output gpt-5.2 / gpt-5.2-chat-latest $1.75 $0.175 $14 gpt-5.2-pro $21 - $168 gpt-5.1 / gpt-5.1-chat-latest $1.25 $0.125 $10 gpt-5-pro $15 - $120
- Price: Documentation (developers.openai.com)
  quote
  Input | $1.25 | 1M tokens; Cached input | $0.125 | 1M tokens; Output | $10 | 1M tokens
- Date: Archived page (openai.com, captured November 13, 2025)
  quote
  November 13, 2025 ... GPT‑5.1 and gpt-5.1-chat-latest are available to developers on all paid tiers in the API.

Gaps in this history

Batch: the model page lists the Batch endpoint as 'Not supported'.

API ids

gpt-5.1-chat-latest

Checked October 28, 2026.