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#Anthropic

All collected and published items, ordered by time. Picks are a selected subset.
Models

New models and versions, open weights, and changes in capability and pricing, with their evaluations.

10/14Wed
  1. The Decoder55

    Artemis launches Orion-1 for autonomous security investigations as AI guardrails constrain defenders

    Artemis Security launched Orion-1 to investigate and respond to corporate network attacks, reporting better results than Claude Opus 5.5 and GPT-6 Sol on its own Decision-Grade Readiness benchmark. Orion-1 scored 80.8 in attack reconstruction versus GPT-6 Sol’s 58.3 and is available in private preview, with human approval required by default for high-impact actions. The comparison excludes Claude Mythos 5 and GPT-6 Astra, while Opus 5.5’s cybersecurity task routing may mean its results largely reflect the older Opus 4.8.

  2. Artificial Analysis · X46

    Claude Sonnet 5.5 Scores 68 on the Coding Agent Index at Max Effort

    In Claude Code, Sonnet 5.5 scores 68 on the Coding Agent Index at max effort and 63 at xhigh. The xhigh setting costs $3.33 per task versus $14.19 at max, a 77% reduction for 5.5 fewer Index points. Max generates 4.8× as many output tokens and takes 3.4× as many turns, while improving all three benchmark scores; its largest gain is on Terminal-Bench 4.0, from 58.1% to 66.2%.

10/9Fri
10/8Thu
  1. Latent Space82

    Anthropic releases Claude Haiku 5.5 at GPT-6 Luna pricing

    Anthropic released Claude Haiku 5.5, the first Haiku-series update in about a year. Its pricing matches OpenAI's GPT-6 Luna. On the same day, Anthropic also cut prices for Sonnet 5.5 and its subscription plans.

    Why it matters: The report brings together Haiku 5.5 pricing, independent evaluations, and token-usage data to help assess cost tradeoffs for small models in agent workflows.

  2. 量子位80

    Anthropic releases Claude Haiku 5.5, matching GPT-6 Luna on benchmarks while cutting prices by 90%

    Anthropic released Claude Haiku 5.5. Its official benchmark scores exceed GPT-6 Luna across the board, making it the new small-model gatekeeper, replacing DeepSeek V4.1 Flash and GLM-5.3-Flash.

    Why it matters: The source provides Haiku 5.5 benchmark scores, tiered pricing, and a migration checklist, helping readers judge which execution-layer tasks it can take on.

  3. Simon Willison78

    Anthropic releases Claude Haiku 5.5 at GPT-6 Luna pricing

    Anthropic released the fast, low-cost Claude Haiku 5.5 at $0.10 per million input tokens and $0.50 per million output tokens, exactly matching GPT-6 Luna, released by OpenAI last month. Above 100,000 tokens, Haiku 5.5 rises to $0.50/$2.50, while Luna does not rise to $0.20/$0.75 until 272,000 tokens.

    Why it matters: The author tested Haiku 5.5 pricing, tokenizer changes, and the cost and latency of different reasoning tiers, offering a basis for weighing it against GPT-6 Luna.

  4. The Decoder82

    Anthropic releases Claude Haiku 5.5 with prices cut by up to 90%

    Anthropic released Claude Haiku 5.5, its fastest and least expensive small model so far. Average prices are about 75% lower than Haiku 4.5; for prompts under 100,000 tokens, prices are up to 90% lower, while prompts above that threshold cost five times as much.

    Why it matters: The source provides Haiku 5.5's pricing table and comparisons across several benchmarks, helping readers assess the tradeoffs for cost-sensitive tasks.

  7. Mike Krieger · X76

    Claude Haiku 5.5 joins the 5.5 family with lower running costs

    Mike Krieger highlights Claude Haiku 5.5 as built for speed and efficiency, costing 75% less than Haiku 4.5. He describes Opus handling heavy thinking and Haiku handling high-volume work. The quoted @claudeai announcement calls it its cheapest, fastest, and most capable small model, with average running costs around 75% lower than Claude Haiku 4.5. https://twitter.com/claudeai/status/2107894039626277339

    Why it matters: The comparison with Haiku 4.5 gives a concrete cost reference for high-volume work, alongside the author's suggested division of labor between Opus and Haiku.

  8. Anthropic · X65

    Anthropic releases Claude Haiku 5.5

    Anthropic released its latest model, Claude Haiku 5.5. According to a post by @claudeai cited in the source, it is the company's cheapest, fastest, and most capable small model so far, with average operating costs about 75% lower than Claude Haiku 4.5.

    Why it matters: Anthropic officially released Haiku 5.5, highlighting an approximately 75% reduction in operating costs compared with the previous generation.

  9. Claude · X74

    Anthropic releases Claude Haiku 5.5 small model

    Anthropic introduced Claude Haiku 5.5, describing it as the cheapest, fastest, and most capable small model it has released. The company says running it costs around 75% less on average than Claude Haiku 4.5. No pricing figures, benchmarks, or availability details were given in the post.

    Why it matters: Anthropic's own announcement states the cost and speed positioning of Claude Haiku 5.5 relative to Haiku 4.5, giving readers the vendor's headline claims for the small model tier.

10/1Thu
  1. The Decoder78

    Google releases Gemini 4 Argon, matching OpenAI and Anthropic but without a clear lead

    Google released frontier model Gemini 4 Argon, matching OpenAI and Anthropic on several benchmarks without a clear lead. It is initially available to 'trusted cyber defenders' in the Fairwind program and Google's internal teams before expanding to developers, businesses, and consumers. Promotional API pricing is $2 per million input tokens and $10 per million output tokens.

    Why it matters: This summary compares third-party and human-preference leaderboards, scores, token use, and pricing for Gemini 4 Argon against OpenAI and Anthropic.

9/30Wed
  2. AWS Machine Learning Blog62

    Claude Sonnet 5.5 launches on Amazon Bedrock and Claude Platform on AWS

    AWS announced that Claude Sonnet 5.5 is available on Amazon Bedrock and Claude Platform on AWS. It is positioned as a more efficient Sonnet model for coding and knowledge work, with lower per-task costs and faster speed for most tasks.

    Why it matters: The source describes Sonnet 5.5 improvements for coding and document tasks, its division of work with Opus 5.5, and access through Bedrock.

  3. The Decoder80

    OpenAI releases GPT-6.1 Sol at one-fifth the cost of Astra

    OpenAI has released GPT-6.1 Sol, saying it approaches the flagship GPT-6.1 Astra—which was delayed over safety concerns—in agentic coding, computer use, and office tasks, at about one-fifth the cost.

    Why it matters: With flagship Astra delayed over safety concerns, readers can compare Sol and Astra with Opus 5.5 on price and benchmark gaps.

9/29Tue
  1. Latent Space78

    AINews: Opus 5.5 excels at generating explainer videos

    Latent Space's AINews roundup of developments from September 24–25 says community feedback was positive after Opus 5.5 launched that week, especially for generating explainer videos with code.

    Why it matters: The weekly roundup offers a quick look at model and agent-infrastructure developments, including community feedback on Opus 5.5's code-generated videos and how vendors position their new models.

  2. Simon Willison80

    Anthropic releases Claude Sonnet 5.5

    Anthropic has released Claude Sonnet 5.5. The company says it runs more than 30% faster and costs up to 30% less on most tasks. It retains Sonnet 5's pricing while outperforming its predecessor across benchmarks.

    Why it matters: The author tests Sonnet 5.5's coding performance and availability on the free tier, and compares it directly with Opus 5.5.

  4. Anthropic · X80

    Anthropic releases Claude Sonnet 5.5

    Anthropic has announced the release of Claude Sonnet 5.5, the second model in the Claude 5.5 family. The company says it runs more than 30% faster than Sonnet 5 and costs up to 30% less for most work.

    Why it matters: Anthropic's official launch of the second Claude 5.5 model gives comparable figures for changes in speed and cost.

9/23Wed
  1. Latent Space88

    Anthropic releases Claude Opus 5.5 as OpenAI launches GPT-6 Sol and Luna the same day

    Anthropic has released Claude Opus 5.5, the first model in its new Claude 5.5 family. The company says it reaches Claude Fable 5.1 levels on most tasks, costs 40% less to run than Opus 5, and becomes the default model in Claude Code and the Claude app.

    Why it matters: Two labs launched new models and cut prices sharply on the same day, giving readers a way to compare their approaches to capability and per-task cost.

  4. Mike Krieger · X75

    Anthropic launches Claude Opus 5.5 with lower running costs than Opus 5

    Mike Krieger says Anthropic launched Opus 5.5 today, describing it as leading in coding and knowledge work and a great writer. He says it performs at the level of Claude Fable 5.1 for most tasks and costs 40% less to run than Opus 5.

    Why it matters: The comparison with Claude Fable 5.1 and Opus 5 gives readers a concrete reference for the release’s claimed performance and running costs.

6/10Wed
  1. Andrej Karpathy · X78

    Karpathy on Claude Fable 5: same base model as Mythos, with a major leap in long-horizon tasks

    Andrej Karpathy says Claude Fable 5 shares the same underlying model as Mythos but adds safety safeguards, and reaches state-of-the-art results by some margin on almost every benchmark.

    Why it matters: Drawing on firsthand use, Karpathy calls Fable 5 a release worthy of a major version-number jump and describes concrete changes on long-horizon tasks.