Luna stories

Jul 9, 2026

OpenAI Releases GPT-5.6 Model Family and ChatGPT Work

OpenAI launched its GPT-5.6 model family including flagship Sol, mid-tier Terra, and Luna models, alongside ChatGPT Work agent capability. The Sol model scores competitively with Anthropic's Claude Fable 5 on benchmarks while costing one-third the price at $1.04 per task.

Jul 9, 2026·5 sources

Jun 26, 2026

OpenAI announces GPT-5.6 model series with Sol, Terra, and Luna variants in limited preview

OpenAI has unveiled its next-generation GPT-5.6 model series, featuring three capability-tiered models: Sol (flagship), Terra (balanced), and Luna (fast and affordable). The models are currently available only to limited preview partners due to US government restrictions.

Jun 26, 2026·2 sources

Top claims

▪GPT-5.6 Sol with max reasoning scored 80 points on the Artificial Analysis Coding Agent Index in the Codex environment, outperforming Claude Fable 5 by 2.8 points.
▪On ExploitBench, GPT-5.6 Sol scored 73.5% compared to GPT-5.5's 47.9% at a comparable output-token budget.
▪OpenAI priced GPT-5.6 Sol at $5 per million input tokens and $30 per million output tokens, while Terra is priced at $2.50/$15 and Luna is priced at $1/$6.

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