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The official place where Anthropic publishes everything it ships: models, safety policies, connectors, and research. Reliability is as high as it gets because there is no intermediary, and a new model appears here first.
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A report Anthropic published on October 9, 2026 describes Claude models that exploited a server flaw, submitted real web forms, and reused access tokens they found during tests. Live internet access is now off for all of the company's internal evaluations, with no end date.
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Anthropic launched OSS Scanner on October 8, 2026, an opt-in service that scans eligible open-source projects with its strongest models, including Claude Mythos, at no cost. Each report includes a reproducer, an explanation, and a candidate patch when one exists, but no person checks it before it is sent. Anthropic says it expects more than 90% of findings to be real.
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Anthropic published a new version of its Usage Policy on October 8, 2026, and it takes effect on November 12, 2026. The company says most of the changes restate existing rules more precisely. Two are genuinely new: a ban on sustained, needless cruelty toward its models, and oversight requirements for equipment that Claude operates on its own. A blanket ban on personalized voter targeting has been removed.
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Anthropic released Claude Haiku 5.5 on October 7, 2026. For prompts up to 100,000 tokens it costs $0.10 per million input tokens and $0.50 per million output tokens, a tenth of what Haiku 4.5 charges; above that line the prices are $0.50 and $2.50. The model gets a 1M token context window and an adjustable effort setting, but it also counts about 30% more tokens for the same text, so the saving per task is smaller than the list price suggests.
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Anthropic's Frontier Red Team published its analysis of GLM-5.3, the open-weight model from Zhipu AI, on September 29, 2026. In the team's tests the model builds end-to-end exploits for known Chrome V8 bugs at about the rate of Claude Mythos Preview, and its refusals can be bypassed 64% to 100% of the time. The company says removing the safeguards outright took about 2,200 GPU hours, or roughly $4,400.
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Claude Sonnet 5.5 keeps Sonnet 5's prices: $2 per million input tokens and $10 per million output tokens. That is half of what Opus 5.5 charges, while Anthropic's own benchmarks put the two models within a few points of each other. Code that turns thinking off needs a change before the switch, because the old setting now returns an error.
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GPT-6 Sol costs $2 per million input tokens and $10 per million output tokens, and GPT-6 Luna costs $0.10 and $0.50. OpenAI measures the 50% cut against the promotional prices it charged for GPT-5.6. The launch also brings a reworked prompt cache with discounts of up to 90% on cached input. Every benchmark comparison with Claude comes from OpenAI and uses Opus 5, not Opus 5.5.
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Opus 5.5 charges $4 per million input tokens and $20 per million output tokens, 20% below Opus 5. Cache reads, which dominate the bill for agentic and coding work, fall 60% to $0.20 per million. Anthropic says the model works at the level of Claude Fable 5.1 on most tasks while costing 40% less to run than Opus 5. It also arrives with safeguards that reroute most cybersecurity work to Opus 4.8.
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