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Model details

gpt-5.1-chat-latest

Positioned within the gpt-codex family, this model is offered as a chat-oriented endpoint with a 128,000-token context window and a 16,384-token maximum output, giving it room for long conversational transcripts, multi-document prompts, and multi-step reasoning chains. Its listed capabilities include attachments, reasoning, tool calling, structured output, and image input, indicating a design that supports agentic workflows where the model can both interpret visual material and invoke external functions. The combination of structured output and tool calling makes it suitable for pipelines that need to parse model responses into application-ready data or coordinate with external services.

In practical terms, the model is aimed at general-purpose chat, code generation assistance, and multimodal understanding tasks, drawing on the lineage of OpenAI's GPT series and o-series reasoning models. It supports advanced reasoning for complex multi-step problems and can accept image inputs alongside text, making it useful for tasks that mix visual and textual context, such as document analysis or interface-related questions. The proprietary API availability and standard token-based pricing put it in the same operational tier as other widely used commercial chat models, favoring teams that need a capable, general-purpose assistant with multimodal and tool-use features.

302.AIgpt-5.1-chat-latestgpt-codex

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Provider
302.AI
Model key
gpt-5.1-chat-latest
Release date
Nov 14, 2025
Last updated
Nov 14, 2025
Knowledge cutoff
2024-09-30
Input modalities
Output modalities
Capabilities

Cost

Input token cost
$1.25
Output token cost
$10.00

Limits

Output tokens
16,384 tokens
Context window
128,000 tokens

Transparent token rates

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Rates are shown per one million tokens. Combined means one million input plus one million output tokens.

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Latest news about gpt-5.1-chat-latest

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Coverage

AIBase reports on OpenAI's launch of GPT-5.1, explicitly naming "gpt-5.1-chat-latest" as the identifier for the latest GPT-5.1 Instant model. The article describes this Instant variant as designed for warmer, more conversational responses and tighter instruction-following, such as replying in exactly six words when req The same piece also covers the GPT-5.1 Thinking model (identifier gpt-5.1) and the GPT-5.1 Auto router that decides whether to send a prompt to Instant or Thinking in ChatGPT, noting adaptive reasoning that makes Thinking roughly twice as fast on simple queries while spending more time on harder topics. Legacy GPT-5 mo

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