Grok 4
xAI's previous model — superseded by Grok 4.6
Verdict
Two releases behind now (4.5, then 4.6). Still functional via the API, but there is no remaining reason to build new on Grok 4 specifically — go straight to 4.6.
Other Text Generation & Reasoning
- GPT-5.6Production
OpenAI current flagship — Sol/Terra/Luna tiers, 1.05M context
- GPT-5Superseded
OpenAI's previous flagship — superseded by GPT-5.6
- 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OpenAI's previous-gen cost-efficient model — superseded by GPT-5 mini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