GPT-5.6 is live, but Sol is not the default answer. I ran the cost math on Sol, Terra, Luna, long context, caching, and four real workloads.
GPT-5.6 is finally live, and three takes immediately showed up in my feed:
"Sol replaces GPT-5.5 everywhere."
"The API still isn't broadly available."
"The 1.05M context window means you can stop thinking about prompt size."
Two are wrong. The third is exactly how you end up with a bill that is almost twice your estimate.
OpenAI Releases GPT-5.6 (Sol, Terra, Luna): A Three-Tier Model Family With Programmatic Tool Calling in the Responses API
The new GPT-5.6 family: Luna, Terra, Sol
GPT-5.6: Frontier intelligence that scales with your ambition
OpenAI sets GPT-5.6 pricing at $5 input, $30 output per 1M tokens with three-tier model family
OpenAI launches GPT-5.6 model family with Sol, Terra, and Luna tiers
OpenAI launches GPT 5.6 model family with Sol as its new flagship
GPT-5.6 Sol nearly matches Fable 5 on aggregated benchmarks at one-third the cost
OpenAI's GPT-5.6 Sol, Terra, and Luna are now available in GitHub Copilot - GitHub Changelog
GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark
OpenAI rolls out its powerful new GPT‑5.6 Sol, Terra and Luna models
OpenAI released GPT-5.6 as Sol, Terra, and Luna, adding Programmatic Tool Calling, ultra multi-agent mode, and tier pricing.
OpenAI’s latest flagship model hit general availability this morning, and comes in three sizes: Luna, Terra, and Sol (from…
More intelligence from every token, stronger performance per dollar, and more capability on demand for your hardest work.
OpenAI launches GPT-5.6 with Sol, Terra, and Luna tiers priced from $1 to $5 per million input tokens, reshaping AI costs for…
OpenAI's GPT-5.6 family includes Sol, Terra, and Luna with tiered pricing from $1 to $5 per million input tokens, launching…
OpenAI's new flagship model is its most capable yet, and its own system card logs cases of it acting beyond user intent,…
