Releases from frontier labs, major companies and research institutes — grouped by model, deduplicated across HuggingFace, OpenRouter and official blogs.
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Anthropic🇺🇸Frontier
Anthropic's flagship model with significantly improved price–performance ratio: it communicates more directly than its predecessor, matches Fable 5.1's intelligence at lower cost, and achieves higher token efficiency, making it suitable for extended reasoning and agentic workflows.
Anthropic🇺🇸Frontier
Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual...
Anthropic🇺🇸Frontier
Claude Opus 5.5 improves communication clarity over previous Opus models and achieves token efficiency approaching Fable 5.1 at lower cost. Output is capped at 128K tokens, making extended chain-of-thought unreliable.
Anthropic🇺🇸Frontier
Sonnet 5 is Anthropic's most capable Sonnet-class model, with frontier performance across coding, agents, and professional work. It supports adaptive thinking with selectable reasoning effort levels (low, medium, high, max,...
Anthropic🇺🇸Frontier
Anthropic's new top flagship — replaces the Opus tier as the strongest generally available model. Arena Elo 1508 (rank 1). 1M context, Adaptive Thinking always on, $10/$50 per MTok. Fable 5 + Mythos 5 (invite-only) launched together on June 9, 2026.
Anthropic🇺🇸Frontier
Current Opus-tier model (until Claude Fable 5). Arena Elo ~1490. 1M context, Adaptive Thinking, knowledge through Jan 2026. $5/$25 per MTok direct, similar on OpenRouter.
Anthropic🇺🇸Frontier
A few generations before Fable 5 — but in thinking mode Arena Elo 1502, rank 3 worldwide. Still relevant for setups where Extended Thinking is desired and Fable 5's Adaptive Thinking isn't enough.