GPT-5.6 Sol

Claims and evidence

• Announced 26 June 2026Announced with GPT-5.6 Terra and GPT-5.6 Luna as a limited preview for a small group of trusted partners, before general availability. ● Primary source[2]first paragraphs [6]Published June 26, 2026; 1. Introduction
• Released 9 July 2026 ● Primary source[3]first paragraph; Availability and pricing [7]July, 2026: Jul 9 [1]Published July 9, 2026

• Status AvailableListed in the API model catalog and not deprecated on the deprecations page as read on 2026-10-01. The ChatGPT models page says the GPT-5.6 models remain available in ChatGPT Work and Codex during the GPT-6 rollout. ● Primary source[4]Snapshots [8]Upcoming deprecations (gpt-5.6-sol appears only as a recommended replacement) [9]Recommended models

• Successor of GPT-5.5The docs say GPT-5.6 Sol roughly corresponds to the unsuffixed model tier of earlier GPT-5 families and compare its price with GPT-5.5; the system card compares GPT-5.6 Sol directly with GPT-5.5 and simulates its deployment in place of GPT-5.5. ● Primary source[4]description; Quick comparison [1]1. Introduction; deployment simulation sections

• Change · Tool use Adds Programmatic Tool Calling in the API and, in beta, multi-agent orchestration in the Responses API.Compared with GPT-5.5 ● Primary source[7]July, 2026: Jul 9
• Change · Reasoning Adds a max reasoning effort level, persisted reasoning and Pro mode in the API.Compared with GPT-5.5 ● Primary source[7]July, 2026: Jul 9
• Change · Safety Served with newly added activation classifiers that watch the model in sensitive domains and can stop unsafe answers during generation.Compared with GPT-5.5 ● Primary source[1]
• Change · Training data Knowledge cutoff of 16 February 2026, against 1 December 2025 for GPT-5.5.Compared with GPT-5.5 ● Primary source[4]Model details [10]Model details

• Input text, image ● Primary source[4]Model details
• Output text ● Primary source[4]Model details
• Feature Reasoning mode ● Primary source[4]description (reasoning.effort); Model details (reasoning token support) [1]2. Model Data and Training
• Feature Function calling ● Primary source[4]Supported features
• Feature Computer use ● Primary source[4]Supported tools
• Context window 1,050,000 tokensThe docs give 922,000 maximum input tokens and 128,000 maximum output tokens. ● Primary source[4]Model details
• Parameters Not disclosedNot disclosed by OpenAI. No claim madeNo source
• Access API, consumer app, cloud partner ● Primary source[3]Availability and pricing [7]July, 2026: Jul 9 [5]July 13–17, 2026: Use GPT-5.6 through Amazon Bedrock [11]context window paragraph

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