GPT-5.6 Sol (August 2026 revision)

Claims and evidence

• Released 6 August 2026 ● Primary source[1]Safety and availability [2]Published August 6, 2026; 1. Introduction [3]August 3–7, 2026: Choose how GPT-5.6 responds in ChatGPT

• Status Status unknownA ChatGPT-only version. OpenAI’s API deprecations page does not cover ChatGPT, and no retirement notice for it was found on 2026-10-01. The GPT-6 Sol, GPT-6 Luna and GPT-6.1 Sol launch posts say those models were not yet available in Chat, and the GPT-6 Astra post (2026-09-03) still refers to a separate GPT-5.6 Sol version in ChatGPT Chat. ◌ Evidence incompleteNo source

• Revision of GPT-5.6 SolOpenAI announced an updated GPT-5.6 Sol for ChatGPT Chat in a dedicated post; the system card separates this August version from the July version that stayed in Codex and ChatGPT Work. ● Primary source[1]first paragraphs; Safety and availability [2]1. Introduction

• Change · Reasoning In ChatGPT, a slider lets Plus and Pro users choose how much thought the model puts into a response, and one model covers both Instant responses and deeper reasoning.Compared with GPT-5.6 Sol ● Primary source[1]More consistent, from quick answers to deeper thinking
• Change · Availability Offered only in ChatGPT conversations, where it replaced GPT-5.5 Instant together with the August GPT-5.6 Luna; Codex and ChatGPT Work kept the July version.Compared with GPT-5.6 Sol ● Primary source[2]1. Introduction [1]Safety and availability
• Change · Other OpenAI says the updated model gives more reliable facts and more focused answers.Compared with GPT-5.6 Sol ● Primary source[1] [3]August 3–7, 2026: Choose how GPT-5.6 responds in ChatGPT

• Feature Reasoning modePlus and Pro users get a slider to choose how much thought the model puts into a response; the same model serves Instant responses and deeper reasoning. ● Primary source[1]More consistent, from quick answers to deeper thinking [2]1. Introduction
• Parameters Not disclosedNot disclosed by OpenAI. No claim madeNo source
• Access consumer app ● Primary source[1]Safety and availability [2]1. Introduction

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