GPT-5
OpenAI's previous flagship — superseded by GPT-5.6
Verdict
Still a capable model and still served, but GPT-5.6 Terra beats it on quality at a similar price. No longer a reason to build new on plain GPT-5 — migrate to GPT-5.6 (Terra for most workloads, Sol if you need the ceiling).
Other Text Generation & Reasoning
- GPT-5.6Production
OpenAI current flagship — Sol/Terra/Luna tiers, 1.05M context
- GPT-5 miniProduction
OpenAI's cost-efficient GPT-5-tier model — most of the quality at a fraction of the cost
- GPT-4oProduction
OpenAI previous-gen multimodal model — text, vision, audio
- GPT-4o miniStable
OpenAI's previous-gen cost-efficient model — superseded by GPT-5 mini
- GPT-OSS 120BStable
OpenAI's first open-weight model — 120B params, fully downloadable
- Claude Fable 5Production
Anthropic's most intelligent generally available model — Mythos-class reasoning