Claude
Anthropic's models: numbered generations, then tier-first names (Opus, Sonnet, Haiku) with a version, and from June 2026 the Fable/Mythos 5 line above Opus.
At a glance
Current release
From the release row Claude Fable 5.1 and Claude Mythos 5.1. One flat rate across the full 1M context; Batch is $5 / $25. Claude Mythos 5.1 (by invitation) shares the specification and price.
Family record: Official documentation · 5 Sep 2026
Built on it
3 products in this catalogue name this family on their own pages.
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Claude API
Anthropic
Official documentation · 5 Sep 2026 -
Claude Cowork
Anthropic
Official documentation · 5 Sep 2026 -
Fireworks AI
Fireworks AI
Official documentation · 5 Sep 2026
Releases
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Claude
First public Claude, offered as Claude (high-performance) and Claude Instant (lighter, cheaper, faster), for summarization, search, writing, Q&A and coding.
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Claude 2
100K-token input, launched with the claude.ai website; Anthropic reported 76.5% on the Bar exam multiple choice and 71.2% on Codex HumanEval, up from Claude 1.3.
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Claude 3
Three tiers introduced, Haiku, Sonnet and Opus, with vision input and a 200K context window; Anthropic claimed Opus outperformed peers on MMLU, GPQA and GSM8K.
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Claude 3.5 Sonnet
First of the 3.5 family, 200K context, claimed to beat Claude 3 Opus at twice the speed and 64% on an agentic coding eval; launched alongside Artifacts.
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Claude 3.7 Sonnet
Presented as 'the first hybrid reasoning model on the market': near-instant or extended step-by-step thinking with a token budget up to 128K; Claude Code launched in preview.
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Claude 4
Claude Opus 4 and Claude Sonnet 4, with extended thinking plus tool use and 72.5% / 72.7% on SWE-bench as reported by Anthropic; Claude Opus 4.1 followed on Aug 5, 2025.
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Claude Sonnet 4.5
Anthropic reported 77.2% on SWE-bench Verified and 61.4% on OSWorld, with 30-hour task focus; the Claude Agent SDK shipped with it and Claude Haiku 4.5 followed Oct 15, 2025.
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Claude Opus 4.5
Opus priced at $5/$25 per million tokens, a new effort parameter, and Anthropic's claim of state-of-the-art SWE-bench Verified with 76% fewer output tokens than Sonnet 4.5.
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Claude Opus 4.6
1M-token context (beta), adaptive thinking, four effort levels, context compaction and agent teams; Anthropic claimed the top Terminal-Bench 2.0 and Humanity's Last Exam scores.
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Claude Opus 4.7
New tokenizer, images up to 2,576 px on the long edge, an 'xhigh' effort level and better instruction following; Claude Opus 4.8 followed on May 28, 2026.
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Claude Fable 5 and Claude Mythos 5
A new tier above Opus: Fable 5 for general use with safety classifiers, Mythos 5 the same model by invitation for defensive cyber work; 1M context, adaptive thinking always on.
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Claude Sonnet 5
1M context, adaptive thinking on by default, $2/$10 per million tokens; Anthropic said it approaches Opus 4.8 with gains on BrowseComp and OSWorld-Verified over Sonnet 4.6.
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Claude Opus 5
Opus tier for long-running agents; Anthropic claimed state of the art on Frontier-Bench and GDPval-AA coding, with a fast mode at about 2.5x speed for double the price.
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Claude Fable 5.1 and Claude Mythos 5.1
Same price as Fable 5 with cache reads at a quarter of the cost; Anthropic reported 55.8% on Terminal-Bench 4.0 and 52.6% on Terminal-Bench-Science, Mythos 5.1 by invitation only.