OpenAI launched the GPT-5.6 series with Sol, Terra, and Luna tiers balancing frontier capability and cost, setting a new coding agent index record with multi-agent parallelism and programmatic tool calling.
Anthropic launched Claude Opus 5 at the same price as Opus 4.8, setting new records on coding and knowledge work benchmarks while approaching the frontier intelligence of Fable 5 and becoming the default on Claude Max.