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Anthropic is a US AI company founded in 2021 with a focus on AI safety. It develops the Claude family of large language models and offers conversational AI and the Claude Code coding tool through its API and apps.
| Model | Input ($/1M tokens) | Output ($/1M tokens) | Released | Source |
|---|---|---|---|---|
| Claude Fable 5 | $10.00 | $50.00 | 2026-06-09 | Source |
| Claude Mythos 5 | $10.00 | $50.00 | 2026-06-09 | Source |
| Claude Opus 5 | $5.00 | $25.00 | 2026-07-24 | Source |
| Claude Opus 4.8 | $5.00 | $25.00 | — | Source |
| Claude Opus 4.7 | $5.00 | $25.00 | — | Source |
| Claude Sonnet 5.5 | $2.00 | $10.00 | 2026-09-28 | Source |
| Claude Sonnet 5 | $2.00 | $10.00 | 2026-06-30 | Source |
| Claude Haiku 4.5 | $1.00 | $5.00 | — | Source |
| Claude Fable 5.1 | $10.00 | $50.00 | 2026-09-01 | Source |
| Claude Mythos 5.1 | $10.00 | $50.00 | 2026-09-01 | Source |
| Claude Opus 5.5 | $4.00 | $20.00 | 2026-09-22 | Source |
Anthropic released Claude Sonnet 5.5 on September 28, 2026. Per-million-token prices stay at Sonnet 5's $2 input and $10 output, while cost per task is down as much as 30% by the company's own testing. It is the first Sonnet model shipped with cyber safeguards.
Akamai announced an expanded agreement with Anthropic: roughly $11.6 billion committed over seven years, aimed at CPU workloads rather than GPUs. Akamai issued its customer a warrant for up to about 5% of its outstanding common stock. A look at the terms, the conditions attached, and the wider context of AI infrastructure procurement.
Anthropic released Claude Opus 5.5 on September 22, 2026. Input is $4 and output $20, 20% below Opus 5, with cache reads down 60%. At the same time, this is the first Opus model to ship with Fable 5.1-class safeguards, and most cybersecurity work is rerouted to Opus 4.8.
In a blog post dated September 13, security firm Hacktron said it combined a libheif vulnerability in the image handling of OpenAI's community forum with a flaw in OpenAI's SSO, then used an employee's Codex to open a PR in an internal repository. We summarize the firm's account that progress stalled with Opus 4.8 but moved forward with Opus 5, and the countermeasures for services that accept image uploads.
On September 17, 2026, Anthropic began accepting beta applications for its Life Sciences Verification Program (LSVP). Vetted teams and institutions can use Mythos 5.1, Opus 5, and Sonnet 5 with classifiers relaxed for biology work. In exchange, 30-day data retention is required, and BAA-enabled organizations cannot join.
On September 17, 2026 Anthropic published three measurements meant to let outsiders track AI development inside frontier labs. Its own figures: Claude leads 26% of its AI R&D, 100% of roughly 30,000 internal agents' actions pass a monitor, and about 6% of AI R&D compute goes to safety.
Anthropic put a rebuilt projects feature into beta in Claude Code on September 17, 2026. Set a goal and a repo and a coordinator carves up the work, with each thread opening PRs on a branch of its own. Because they run in parallel, Anthropic says usage limits arrive sooner.
In an exclusive interview published by Fortune on September 12, 2026, Sam Altman said that going public right now would be an 'ill-advised moment' and ruled out a 2026 listing. He also said he is happy to delay the IPO for the sake of safety.
The change to Claude Code's weekly usage limits that Anthropic announced in late August takes effect on September 14, 2026. It is a permanent 25% raise against the original baseline, but the temporary 50% boost ends the same day, leaving about 17% less than the level just before.
A declaration titled 'A Severe Misalignment of AI in Mathematics,' signed by 25 Fields Medalists including Terence Tao, Peter Scholze and Shigefumi Mori. It argues that treating hard problems as a benchmark to be solved is harmful to mathematics as a science, and that the goals of AI companies and of the mathematical community are severely misaligned. In the same week, a dispute over credit surrounding OpenAI's Navier–Stokes announcement came into the open.
Dario Amodei's essay 'We Must Pace the Frontier,' posted on his personal site, argues for slowing the rate of capability gains and sets out a three-step framework. Anthropic is unilaterally committing to the first step: embedded third-party evaluators, given desks, access badges, and company laptops, with no editorial control by Anthropic over what they publish.
On September 11, 2026, the startup Accomplish published how opening an untrusted repository in Claude Code could let commands run outside the macOS sandbox without a permission prompt. It says it reported the issue on July 13 and that it was fixed in 2.1.247.