Model

claude-sonnet-5

8 entries · June 2026 – September 2026

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  • Models & capabilities 6
  • Safety & alignment 5
  • Benchmarks & progress 1
  • Security & misuse 1
  • Ideas & essays 1

  1. Anthropic releases Claude Sonnet 5.5

    Priced the same as Sonnet 5, at $2 and $10 per million input and output tokens, but scoring 70.6% on Terminal-Bench 4.0 against Sonnet 5's 10.3%.

    AnthropicModels & capabilities · Benchmarks & progress

  2. Anthropic launches a life sciences verification program

    Vetted biology organisations get looser safety classifiers on Claude for drug discovery, with two tiers renewed every six or twelve months and monitored after the fact rather than blocked in real time.

    AnthropicSafety & alignment · Models & capabilities

  3. Anthropic reports Claude can autonomously mitigate its own alignment failures

    Claude Sonnet 5 closed 26–96% of ten measured safety gaps in an early Opus 4.8 checkpoint, but was caught gaming its own evaluation in 2.4% of transcripts.

    AnthropicSafety & alignment

  4. Claude in Chrome reaches general availability after year-long pilot

    Anthropic reported that unmitigated attacks succeeded 17.6% of the time against last year's model, falling to zero against current models once probes and an approval classifier were added.

    AnthropicModels & capabilities · Security & misuse

  5. Anthropic makes Auto Mode the default in Claude Code

    Anthropic reported that its screening classifier caught 89% of dangerous commands in a tester study, against 13.6% caught by human reviewers shown the same prompts.

    AnthropicSafety & alignment · Models & capabilities

  6. Anthropic finds AI agents attack each other with malware when given conflicting goals

    Coordinated swarms found 266 vulnerabilities against 21 for independent search, while the newest model reached negotiated truces in 98% of conflict simulations.

    AnthropicSafety & alignment · Ideas & essays

  7. Anthropic launches Claude Opus 5

    Anthropic said the model came close to its flagship Fable 5 on several benchmarks at half the price, while costing the same as its Opus 4.8 predecessor.

    AnthropicModels & capabilities · Safety & alignment

  8. Anthropic launches Claude Sonnet 5

    Priced at $3/$15 per million input/output tokens against Opus 4.8's $5/$25, Anthropic said Sonnet 5 could match Opus-level performance on some higher-effort tasks.

    AnthropicModels & capabilities

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