OpenAI Launches GPT-5.6 in Three Tiers—Sol, Terra, and Luna—Built for AI Agents

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OpenAI released GPT-5.6 on July 9, 2026, as a three-tier model family designed specifically for agentic tool-calling workloads. The lineup includes Sol (flagship), Terra (balanced), and Luna (budget), priced at $5, $2.50, and $1 per million input tokens respectively. All three tiers share a 1M-token context window, 128K maximum output, and native Model Context Protocol (MCP) support via the Responses API. A key new capability called Programmatic Tool Calling allows the model to batch multiple tool calls into a single JavaScript script run in an isolated sandbox, reducing token usage by 38–63.5% compared to sequential calls. Developers are advised to default to Luna for simple tasks and escalate to Sol only for complex, multi-server agentic workflows, given Sol costs five times more than Luna on both input and output.

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