Anthropic
16 active models Β· 2 deprecated Β· Official website β
Active Models
Claude Opus 5.5
β ActiveFirst model of the Claude 5.5 family with a 1M context window, always-on adaptive thinking, and lower pricing than Opus 5
Claude Fable 5.1
β ActiveAnthropic's most capable generally available model, a Mythos-class model with safeguards for the most demanding reasoning and long-horizon agentic work
Claude Opus 5
β ActiveClaude 5 generation Opus model with a 1M context window, adaptive thinking, and Fast Mode; superseded by Opus 5.5
Claude Sonnet 5
β ActiveClaude 5 generation Sonnet model with a 1M context window and near-Opus coding performance at Sonnet pricing
Claude Fable 5
β ActiveFirst Claude 5 family model: a Mythos-class model made safe for general use with additional safeguards for cyber, bio-chem, and distillation requests
Claude Opus 4.8
β ActivePrevious-generation Opus model with stronger long-context reasoning, coding, and agentic tool-use performance
Claude Opus 4.6
β ActiveMost capable Claude model with advanced reasoning and extended thinking
Claude Opus 4.7
β ActiveLatest Opus model with a 1M context window, stronger tool use, and improved long-horizon coding
Claude Opus 4.5
β ActivePremium Claude model with enhanced creative and analytical capabilities
Claude Opus 4
β ActiveFirst Claude 4 Opus model with breakthrough capabilities
Claude Sonnet 4.6
β ActiveLatest Sonnet model balancing performance with speed and cost
Claude Sonnet 4.5
β ActiveHigh-performance Sonnet model with excellent coding abilities
Claude Sonnet 4
β ActiveBalanced Claude 4 model for everyday tasks
Claude Haiku 4.5
β ActiveFast and affordable Claude model for high-volume tasks
Claude 3.7 Sonnet
β ActiveHybrid reasoning model with extended thinking capabilities
Claude 3.5 Sonnet
β ActiveWidely adopted model that set new performance benchmarks
Deprecated Models
Change History
Claude Opus 5.5 released with a 1M context window, up to 128K output tokens, always-on adaptive thinking, and a June 2026 knowledge cutoff
Pricing set at $4.00 per 1M input tokens and $20.00 per 1M output tokens, 20% below Opus 5; cache reads drop to $0.20 per 1M tokens
Breaking changes from Opus 5: thinking can no longer be disabled, forced tool use returns an error, thinking blocks are bound to the model and conversation, and the computer_20251124 tool was removed; default effort changed from high to medium
Anthropic announced Claude Sonnet 5.5 and Claude Haiku 5.5 will follow in the coming weeks
Moved to the legacy model list after the release of Claude Opus 5.5; remains available for compatibility and migration comparisons
Claude Fable 5.1 released alongside the restricted-access Claude Mythos 5.1, with a 1M context window, 128K max output, always-on adaptive thinking, and a June 2026 knowledge cutoff
Pricing unchanged from Fable 5 at $10.00 per 1M input tokens and $50.00 per 1M output tokens; cache reads cut 75% from $1.00 to $0.25 per 1M tokens
Forced tool use behavior changed (breaking change); Anthropic recommends starting workloads on Opus and escalating to Fable 5.1
Introductory rate of $2.00 input and $10.00 output per 1M tokens made the standard price; the previously scheduled increase to $3.00 and $15.00 was dropped
Superseded by Claude Fable 5.1 and moved to the legacy model list
Claude Mythos 5.1 released as the trusted-access sibling of Fable 5.1 for vetted cyberdefense and life-science organizations
Claude Opus 5 released as the successor to Opus 4.8 with a 1M context window, adaptive thinking with low/medium/high/xhigh/max effort, and Fast Mode output about 2.5x faster
Pricing set at $5.00 per 1M input tokens and $25.00 per 1M output tokens; cached input $0.50 per 1M tokens
Claude Opus 5 replaced Opus 4.8 as the default model on the Claude Max plan
Superseded by Claude Opus 5 as the default Max plan model and moved to the legacy model list
Fable 5 became a standard feature of Anthropic's higher-tier subscription plans after several extensions of the launch promotion
Claude Sonnet 5 released with a 1M context window, 128K max output, adaptive thinking, and a January 2026 knowledge cutoff
Introductory pricing set at $2.00 per 1M input tokens and $10.00 per 1M output tokens through August 31, 2026, with no long-context surcharge
Sonnet 5 uses the updated tokenizer shared with Opus 4.7+ and Fable 5, producing roughly 1.0x to 1.35x as many tokens as Sonnet 4.6 for the same text
Access to Fable 5 and Mythos 5 was temporarily restricted following a U.S. Department of Commerce export-control directive; Anthropic later confirmed access was restored
Claude Fable 5 released as a Mythos-class model for general use, alongside Claude Mythos 5 for Project Glasswing partners; 1M context window and up to 128K output tokens
Pricing set at $10.00 per 1M input tokens and $50.00 per 1M output tokens, less than half of Claude Mythos Preview
Claude Mythos 5 released as a trusted-access preview to a small number of Project Glasswing partners; identical to Fable 5 apart from safeguards
Trusted-access pricing matches Fable 5 at $10.00 per 1M input tokens and $50.00 per 1M output tokens
Claude Opus 4.8 released as Anthropic's latest high-capability model with a 1M context window
Pricing remains $5.00 per 1M input tokens and $25.00 per 1M output tokens
Claude Opus 4.7 released with a 1M context window, stronger tool use, and improved agentic coding performance
Pricing set at $5.00 per 1M input tokens and $25.00 per 1M output tokens
Claude Mythos Preview introduced as a gated research preview through Anthropic's Project Glasswing security initiative
Preview participant pricing listed at $25.00 per 1M input tokens and $125.00 per 1M output tokens after included usage credits
Claude Opus 4.6 launched with improved reasoning and coding
Claude Opus 4.5 released with improved creative writing
Claude Sonnet 4.5 launched with improved coding performance
Claude Haiku 4.5 released with improved speed and capability
Claude Opus 4 launched as most capable Claude model to date
Claude 3.7 Sonnet launched with extended thinking capability
Claude 3.5 Sonnet launched, outperforming Claude 3 Opus