Anthropic model releases

The restricted sibling of Claude Fable 5.1, announced Sep 1, 2026. It is the same underlying model as Fable 5.1 but ships with more permissive safeguards for vetted users, available only through Anthropic's trusted-access programs — the Cyber Verification Program (defensive security work) and the Life Sciences Verification Program (professional biology R&D, developed with the US government). Anthropic reports it has the strongest cyber capabilities of any model it has released (still within the lower risk tier of its Frontier Compliance Framework) and scores 60.9% on Terminal-Bench 4.0 (vs 55.8% for safeguarded Fable 5.1). Also powers Claude Security's codebase vulnerability scanning. Access is currently limited to a set of US organizations. Not publicly token-billed, so list pricing is not recorded.

Anthropic's most capable widely released model, launched Sep 1, 2026 (API id claude-fable-5-1) as a direct upgrade to Claude Fable 5 for agentic coding, long-running problem-solving, and knowledge work. Anthropic reports gains across coding, computer use, multidisciplinary reasoning, and finance/analysis while producing more concise plans and summaries, and cites benchmark results including Terminal-Bench 4.0 55.8%, Terminal-Bench-Science 0.1 52.6%, Humanity's Last Exam 65.0% (with tools), and CursorBench 3.2.0 73.4%. Base pricing is unchanged from Fable 5 at $10/$50 per Mtok input/output, but cache reads were cut 75% to $0.25/Mtok, reducing typical workload cost ~25% (up to ~45% for highly agentic work). Carries a 1M-token context and up to 128K output tokens; available on the Claude API, AWS, Google Cloud, and Microsoft Azure. Cybersecurity safeguards were loosened to allow defensive vulnerability discovery (Claude Code sees ~60% fewer false-positive interventions), while dual-use cyber and life-sciences R&D requests still route to Opus models. First Anthropic release to carry the EU AI Act text watermark.

Anthropic's flagship Opus model, released July 24, 2026 — positioned as the go-to model for most knowledge work and automation, approaching the capability of Claude Fable 5 in many categories at roughly half the price. Built for demanding reasoning, autonomous coding, software development, and long-horizon agentic work. Introduces a five-level 'effort' dial exposed to developers on the Claude API and Platform, letting them trade compute and tokens for capability — at lower effort it preserves much of its performance while using fewer tokens and costing less to run. 1M-token context window (available at standard token pricing, not a separate long-context surcharge) with up to 128K output tokens; text, vision, and code. Standard API pricing $5/$25 per Mtok (the same as its predecessor Opus 4.8), plus a Fast mode at $10/$50. Anthropic describes it as its most aligned Opus model and the least susceptible to being tricked into misuse. Becomes the default model for Claude Max subscribers and is available across Anthropic's paid plans; scores 61 on the Artificial Analysis Intelligence Index. Closed weights; architecture, parameter count, and training compute undisclosed.

Anthropic's most agentic Sonnet model yet, with performance approaching Claude Opus 4.8 at a lower price. Built for coding, tool use (browsers and terminals), and autonomous multi-step agentic work, with selectable effort levels up to xhigh. A substantial upgrade over its predecessor Sonnet 4.6 on reasoning, tool use, coding, and knowledge work, with gains shown on SWE-bench, OSWorld-Verified, BrowseComp, and Humanity's Last Exam. The default model on the Free and Pro plans and available to Max, Team, and Enterprise users; in Claude Code and via the Claude API as claude-sonnet-5. Uses an updated tokenizer (same approach as Opus 4.7). Ships with real-time cyber safeguards enabled by default. Introductory API pricing of $2/$10 per Mtok through Aug 31, 2026, then standard $3/$15.

The public, guardrailed sibling of Claude Mythos 5 and Anthropic's most capable widely released model, built for long-horizon agentic work, coding, vision, and knowledge workflows. Launched June 9, 2026 across the Claude API, AWS, and Microsoft Foundry, then suspended three days later under a U.S. export-control directive. Anthropic says those controls were lifted June 30 and Fable 5 was restored globally on July 1 across Claude Platform, Claude.ai, Claude Code, and Claude Cowork, with cloud partner access being re-enabled. Its safeguards route flagged cybersecurity, biology/chemistry, and distillation requests to Claude Opus 4.8.

Anthropic's most capable model, with strengthened agentic and long-running task performance.

The restricted sibling of Claude Fable 5, sharing the same underlying Mythos-class model with fewer safeguards for vetted defensive-security and research use. Anthropic disclosed Mythos Preview on April 7, 2026, upgraded approved Project Glasswing users to Mythos 5 on June 9, suspended access under a U.S. export-control directive on June 12, and restored limited access for approved U.S. organizations on July 1 while it continues expanding the trusted-access program.

Introduced genuinely autonomous multi-file coding and stronger computer use.

Anthropic's fast, low-cost Claude 4.5 model, released in October 2025 for latency-sensitive coding, tool-use, and customer-facing agent workloads. Anthropic positions it as bringing near-Sonnet capability to the Haiku tier at substantially lower cost and higher speed.

Anthropic's September 2025 Sonnet release, positioned as its strongest model for coding, agents, and computer-use workflows at launch. Proprietary API model with text, vision, and code capabilities, 200K context, and Sonnet-tier list pricing.

Anthropic's August 2025 Opus point release, focused on stronger coding, reasoning, and agentic reliability over Claude Opus 4. Proprietary API model with text, vision, and code capabilities.

First Claude 4 Opus model, positioned for long-running agentic and coding work before the 4.x point releases.

Anthropic's first hybrid-reasoning Sonnet. Shut down May 11, 2026 as the 4.x line matured.

Fast, lower-cost Claude 3.5 model for latency-sensitive coding, tool-use, and customer-facing workloads.

Major Sonnet upgrade that became Anthropic's default high-intelligence workhorse for coding, writing, and visual reasoning.

Highest-capability Claude 3 model, launched with Sonnet and Haiku and Anthropic's first major vision-capable Claude family.

Claude update with a 200K context window, lower hallucination rates, and improved tool-use beta support.

Anthropic's first widely-available Claude, notable for an early 100k-token context window.

Anthropic's first broadly announced Claude assistant model, launched through an API and select product partners.