GPT-6 Astra vs GPT-5.5 and GPT-5.4: Compatibility, Retirement and Evaluation
Evaluate GPT-6 Astra against older GPT-5.5 and GPT-5.4 routes with official availability boundaries, Codex retirement facts, compatibility checks and rollback steps.
Evaluate GPT-6 Astra against older GPT-5.5 and GPT-5.4 routes with official availability boundaries, Codex retirement facts, compatibility checks and rollback steps.
Compare GPT-6 Astra with Claude Fable 5.1, Gemini 3.1 Pro Preview and GPT-5.6 Sol using current primary specs, pricing boundaries and a fair test protocol.
Claude Opus 4.7 launched April 16, 2026. Full breakdown of benchmarks, hidden tokenizer costs, agentic features, documented regressions, and a routing framework for marketers and developers.