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Anthropic updated its models documentation to include Claude Opus 4.8, Sonnet 5, and Haiku 4.5 alongside Fable 5, replacing the previous Mythos 5 listing. Opus 4.8 is priced at $5/$15 per MTok (input/output), Sonnet 5 at $3/$15, and Haiku 4.5 at $1/$5. Haiku 4.5 supports extended thinking. This is a
New models (Opus 4.8, Sonnet 5, Haiku 4.5) introduce new pricing tiers and capabilities. Haiku 4.5 supports extended thinking, which may affect cost for certain use cases. Migration may be needed to adopt new model IDs.
If you're unsure which model to use, consider starting with Claude Opus 4.8 for the most complex tasks. It is Anthropic's most capable Opus-tier model for complex reasoning, long-horizon agentic coding, and high-autonomy work. For workloads that need the highest available capability, see Claude Fable 5 . Claude Fable 5 ( claude-fable-5 ) is Anthropic's most capable widely released model. Claude Mythos 5 ( claude-mythos-5 ) joins the invitation-only Claude Mythos Preview ( claude-mythos-preview ) within Project Glasswing . See Introducing Claude Fable 5 and Claude Mythos 5 for launch details and API changes. Feature Claude Fable 5 Claude Mythos 5 Description Anthropic's most capable widely released model, for the most demanding reasoning and long-horizon agentic work Available through Project Glasswing. Successor to Claude Mythos Preview. Claude API ID claude-fable-5 claude-mythos-5 AWS Bedrock ID anthropic.claude-fable-5 Limited availability Google Cloud ID claude-fable-5 Limited availability Extended thinking No No Adaptive thinking Yes (always on) Yes (always on) Context window 1M tokens 1M tokens Max output 128k tokens 128k tokens Pricing $10 / $50 per MTok (input / output) $10 / $50 per MTok (input / output)
If you're unsure which model to use, start with Claude Opus 4.8 for complex agentic coding and enterprise work. For workloads that need the highest available capability, use Claude Fable 5 . Claude Fable 5 ( claude-fable-5 ) is Anthropic's most capable widely released model. Claude Mythos 5 ( claude-mythos-5 ) shares Claude Fable 5's specs and pricing and joins the invitation-only Claude Mythos Preview ( claude-mythos-preview ) within Project Glasswing . See Introducing Claude Fable 5 and Claude Mythos 5 for launch details and API changes. Feature Claude Fable 5 Claude Opus 4.8 Claude Sonnet 5 Claude Haiku 4.5 Description Next-generation intelligence for long-running agents For complex agentic coding and enterprise work The best combination of speed and intelligence The fastest model with near-frontier intelligence Claude API ID claude-fable-5 claude-opus-4-8 claude-sonnet-5 claude-haiku-4-5-20251001 Claude API alias claude-fable-5 claude-opus-4-8 claude-sonnet-5 claude-haiku-4-5 AWS Bedrock ID anthropic.claude-fable-5 3 anthropic.claude-opus-4-8 3 anthropic.claude-sonnet-5 3 anthropic.claude-haiku-4-5-20251001-v1:0 Google Cloud ID claude-fable-5 claude-opus-4-8 claude-sonnet-5 claude-haiku-4-5@20251001 Pricing 1 $10 / input MTok $50 / output MTok $5 / input MTok Extended thinking No No No Yes Adaptive thinking Yes (always on) Yes Yes No
If you're unsure which model to use, start with Claude Opus 4.8 for complex agentic coding and enterprise work. For workloads that need the highest available capability, use Claude Fable 5 .