OpenAI Launches the GPT-5.6 Family
Latent Space · rss · 2026-07-10
OpenAI released the new GPT-5.6 family: Sol, Terra, Luna, alongside expanding the product ecosystem around these models.
Key Changes
- Model Tiers:
- Sol: Flagship / highest ceiling
- Terra: Balanced, lower-cost tier
- Luna: Fastest, cheapest, high-throughput tier
- Reasoning Tiers: Introduced a higher ultra mode, which by default coordinates multiple agents to process complex tasks in parallel.
- Product Side: ChatGPT Work, a desktop app integrating Codex, Sites beta, programmatic tool calling via the Responses API, and a multi-agent beta.
Official & Third-Party Performance
- OpenAI claims Sol achieved 53.6 on Agents’ Last Exam, highlighting improvements in complex tasks, coding workflows, and document/spreadsheet/presentation generation.
- API pricing is segmented by tier, introducing cache-write billing for the first time.
- Independent evaluations generally consider Sol to be at the frontier, particularly excelling in coding agent workloads; however, shortcomings remain in hallucination rates on certain benchmarks and layout/chart parsing.
Additional Info
- The article also mentions OpenAI's capability improvements in cyber/bio-related tasks and a clearer safety review mechanism.
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