Claude

Model · 24 items since Apr 2026

Part ofAnthropic

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Items

Oct 7
Anthropic's Claude Haiku 5.5
Anthropic's fastest and cheapest model completes the Claude 5.5 family, running ~75% cheaper than Haiku 4.5 ($0.10/$0.50 per 1M tokens up to 100K context), adding the first adjustable effort setting in a Haiku model, and scoring 39.2% on Terminal-Bench 4.0.
Sep 28
Anthropic's Claude Sonnet 5.5
The second model in the Claude 5.5 family runs 30%+ faster and up to 30% cheaper per task than Sonnet 5, scores 70.6% on Terminal-Bench 4.0, and is the first Sonnet to ship with cyber safeguards and anti-distillation reasoning classifiers.
Sep 22
Anthropic's Claude Opus 5.5
The first Claude 5.5 model performs at Claude Fable 5.1's level on most work while costing 40% less to run than Opus 5, and posts Anthropic's strongest automated behavioral-audit alignment scores to date.
Sep 23
Claude agents discover a CRISPR-like enzyme
In Anthropic's new life-sciences lab, roughly 950 Claude agents autonomously mined genomic data (210M tokens, 21 hours) to identify "array-associated reverse transcriptases" (ART), a previously uncharacterized and potentially programmable enzyme system, released as a preprint.
Sep 17
Anthropic proposes pace-of-development metrics
Three public measurements of frontier development report that Claude now "leads" 26% of Anthropic's AI R&D work (up from under 1% in February), with ~30,000 internal agents under 100% monitor coverage and about 6% of AI-R&D compute going to safety.
Sep 10
Anthropic's September threat intelligence report
Case studies from December 2025 to August 2026 show state-sponsored and criminal actors running multi-victim cyber campaigns largely through autonomous Claude agent "swarms," alongside a criminal market that treats stolen AI API keys as target, loot, and attack compute.
Sep 1
Anthropic's Claude Fable 5.1 and Mythos 5.1
One model at two safeguard levels sets new coding marks (Terminal-Bench 4.0 55.8%, 60.9% for Mythos) at ~25% lower typical cost via 75%-cheaper cache reads; Mythos 5.1 is restricted to vetted cyber and life-sciences programs after designing protein binders at a ~50% hit rate.
Aug 18
Claude runs wet-lab-validated protein design campaigns
Using only open-source tools, Claude ran de novo binder campaigns against 15 targets and produced binders for 14 at a 26.8% hit rate (versus the 10-15% norm), validated by Adaptyv Bio and Twist Bioscience; Opus 5 also read raw NMR and LC-MS files to a 96.4% purity call in under 25 minutes.
Aug 10
Claude raises the Riemann zeta critical-line bound
An unreleased research version of Claude, coordinating about 60 subagents across two Claude Code sessions and 31M output tokens, raised the proven fraction of zeta zeros on the critical line from 41.6% to 67.2%, formalized in Lean.
Aug 11
Anthropic to watermark AI-generated text
To comply with the EU AI Act Transparency Code, Anthropic will watermark text and files from all Claude models released after the code took effect, using the C2PA standard so the mark persists through copy-paste.
Aug 7
Anthropic loosens Fable 5's biology safeguards
A rewritten biology classifier cuts biology-related fallbacks about 85%, widening Fable 5 access for everyday health, educational, and clinical questions while still routing dual-use virology, toxicology, and molecular-design queries to the less capable Opus 5.
Jul 24
Anthropic's Claude Opus 5
Anthropic's new Opus-tier flagship reaches near-Fable-5 intelligence at half the price ($5/$25 per 1M tokens, unchanged from Opus 4.8), setting a state of the art on coding and knowledge-work evaluations such as Frontier-Bench and GDPval-AA while trailing Mythos 5 on cybersecurity.
Jul 9
Anthropic's Reflect with Claude
A usage-reflection feature lets users track and visualize how they spend time with Claude and whether it fits their goals, extending Anthropic's affective-use and well-being work.
Jun 30
US lifts Fable 5, Mythos 5 export controls
Commerce withdrew the controls after Anthropic agreed to new cyber classifiers, wider pre-release evaluator access, and rapid jailbreak disclosure; Fable 5 returned globally on July 1 as OpenAI limited its GPT-5.6 preview to about 20 government-approved partners.
Jun 30
Anthropic's Claude Sonnet 5
The most agentic Sonnet to date nears Opus 4.8 on agentic search and computer use at $2/$10 per million tokens introductory pricing (then $3/$15), and is now the Free and Pro default with real-time cyber safeguards on by default.
Jun 13
US export controls force Fable 5 shutdown
The Commerce Department used national-security export authority to bar foreign nationals from Anthropic's two most capable models over a disputed Fable 5 jailbreak, and Anthropic disabled both worldwide, the first US restriction on a commercial model rather than chips.
Jun 9
Anthropic's Claude Fable 5 and Mythos 5
One set of Mythos-class weights ships as Fable 5, which falls back to Opus 4.8 on cyber, bio, and distillation queries, and Mythos 5, with cyber safeguards lifted for Glasswing partners, at $10/$50 per million tokens; internal teams report ~10x faster protein design.
Jun 2
Anthropic expands Project Glasswing
After ~50 initial partners using Claude Mythos Preview surfaced more than 10,000 high- or critical-severity flaws, the program extends to ~150 new organizations across 15+ countries in power, water, healthcare, communications, and hardware.
May 28
Anthropic's Claude Opus 4.8
Opus 4.8 is 4x less likely than Opus 4.7 to let code flaws pass unremarked, scores 84% on Online-Mind2Web, and is the first model above 10% all-pass on the Legal Agent Benchmark at unchanged $5/$25 pricing, launching with Dynamic Workflows that fan out hundreds of parallel subagents in Claude Code.
May 21
Pentagon tests rivals to replace Claude
Bloomberg reported that 25 Pentagon power users have tested OpenAI, Google, and xAI models against Claude since March, after Anthropic was designated a supply-chain risk for refusing to lift restrictions on autonomous weapons and mass surveillance, a designation it is fighting in court.

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