AI Models

GPT-5

OpenAI's GPT-5 model, released August 2025. Unified fast and reasoning modes in one model. Superseded by the GPT-6 family in September 2026 and now marked deprecated in the API.

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GPT-5 is the OpenAI model released in August 2025 that marked a significant jump in reasoning, coding, math, and long-context performance over GPT-4o. It unified the capabilities that were previously split across separate models (GPT-4o for speed, o3 for reasoning) into a single model that adaptively allocates compute based on task difficulty. OpenAI's API docs now list it as a deprecated previous model with a 400K context window at $1.25 per million input tokens and $10 per million output tokens, and point developers to the GPT-6 family: GPT-6 Astra (September 2026) for the most demanding work, GPT-6.1 Sol (September 29, 2026) for near-Astra performance at lower cost, and GPT-6 Luna for high-volume tasks. Keep GPT-5 only for existing integrations you have not migrated yet.

ai model openai reasoning coding deprecated

GPT-5 at a glance

Last verified October 29, 2026

Pricing: API - $1.25/1M input tokens, $0.125/1M cached input, $10/1M output tokens
Deprecated - removed from the API on December 11, 2026
Install: npm install openai
pip install openai
Models: A single snapshot, gpt-5-2025-08-07, with a 400K context window, 128K max output, text and image input, and reasoning effort settings of minimal, low, medium or high. OpenAI's model page recommends GPT-6 Astra instead, and the deprecation notice names gpt-5.6-sol as the replacement.
Recent changes: Dec 11Scheduled: gpt-5-2025-08-07 shuts down in the OpenAI API. The recommended replacement is gpt-5.6-sol.
Sep 29GPT-6.1 Sol releases for complex coding and professional work at a lower cost than GPT-6 Astra: $2 input and $10 output per 1M tokens.
Sep 3GPT-6 Astra releases as OpenAI's most capable model. The GPT-5 model page now points developers to it.

Sources: GPT-5 model page, OpenAI API deprecations, OpenAI API changelog, OpenAI developer quickstart

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OpenAI's GPT-5 model, released August 2025. Unified fast and reasoning modes in one model. Superseded by the GPT-6 family in September 2026 and now marked deprecated in the API.

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