Sonnet 5.5
Sonnet 5.5 is an AI model released by Anthropic alongside Opus 5.5. Recent coverage highlights its performance, noting it matches Opus 5.5 on specific tasks using the 1020 trick. The model is also integrated globally by Barclays and compared to Vercel's Jev, which reached higher adoption rates in two weeks.
Sonnet 5.5 is a language model from Anthropic, first covered on 28 September 2026. It is available through an API.
Last updated
Quick facts
- Who makes Sonnet 5.5?
- Sonnet 5.5 is made by Anthropic. Anthropic news →
- When was Sonnet 5.5 released?
- The first report of Sonnet 5.5's release that Digest AI covered was published on 28 September 2026. Anthropic cuts AI costs with faster, cheaper Claude Sonnet 5.5 →
- What type of model is Sonnet 5.5?
- Sonnet 5.5 is a language model.
- Where is Sonnet 5.5 available?
- Sonnet 5.5 is available through an API.
Taken from the coverage, not from our own testing. A question is left out when none of the reports we read gave the answer. All tracked models →
18 stories about Sonnet 5.5
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Microsoft releases Copilot October 2026 update with deeper Office integration
Microsoft released the Copilot October 2026 update, moving beyond prompt‑and‑response to deeper integration across Microsoft 365. It adds AI‑assisted creation, editing, analysis, and collaboration in Excel, PowerPoint,…
1 sourcetechgenyz.com -
Google launches Gemini 4 Carbon for cybersecurity defenders via Fairwind at $2/$10 per million tokens
Google announced Gemini 4 Carbon, its newest frontier AI model, emphasizing state-of-the-art cybersecurity capabilities. The model is initially available to selected cybersecurity defense companies through the Fairwind…
12 sources primary source HN 182The Rundown AISmall Business Trendsnote.comLatent Space +7 more -
Anthropic says unreleased model built working exploits for Chrome, Safari, Windows, Linux
Anthropic reported that an unreleased internal AI model identified security flaws in major operating systems and browsers, chaining them into working proof-of-concept exploits. The company stated the model required…
4 sourcestech.yahoo.comnotebookcheck.netthehackernews.com -
Anthropic reports 3.6x jump in token volume after Claude Opus 5.5 launch
Anthropic's Claude Opus 5.5 model launch on September 22, 2026, led to a reported 3.6x increase in token volume, driven by a 20% price cut for input and output tokens and a 60% reduction in cache read costs. The model…
5 sourcesLatent SpaceTechCrunch AInote.comcryptobriefing.com -
Anthropic Claude Opus 5.5 rejects disabled thinking, causing 400 errors
Anthropic has released Claude Opus 5.5, Fable 5.1, and Sonnet 5.5, introducing breaking changes to the API that may disrupt existing automation. The most significant change is that Claude Opus 5.5 no longer accepts…
1 sourcenote.com -
Anthropic cuts Haiku 5.5 API costs by 90% for short inputs
Anthropic announced Claude Haiku 5.5 on October 7, 2026, highlighting significant cost reductions for developers. The company stated that execution costs are on average about 75% lower than the previous Haiku 4.5. For…
4 sourcesmodelcompare.aiUnite.AIKDnuggetsnote.com -
Llama.cpp merges support for IBM Granite Switch 4.1
A pull request to the llama.cpp repository, titled "Granite switch decision," was merged on October 16, 2026. The change adds support for the IBM Granite Switch 4.1 8B model, specifically implementing its "guardian and…
1 source primary sourcegithub.com -
Vercel data shows Jev hits 35% adoption in two weeks
Vercel’s internal data reveals its AI model Jev became the fastest-adopted model ever, reaching 35% of paid teams within two weeks of its September 15 launch. That exceeds Sonnet 5.5’s reach by nearly double, according…
1 sourceTechCrunch AI -
Anthropic cuts Haiku 5.5 pricing to match OpenAI’s GPT-6 Luna
Anthropic released Claude Haiku 5.5 on October 6, 2026, positioning it as a cheaper, faster alternative to OpenAI’s GPT-6 Luna at the same price. The model supports 1M-token context (up from 200K) and includes effort…
1 sourceLatent Space -
Anthropic releases Claude Haiku 5.5 at lower prices than GPT-6 Luna
Anthropic launched Claude Haiku 5.5 on October 7, 2026, a faster and cheaper model than its predecessor, Haiku 4.5, which was released nearly a year ago. The new model matches GPT-6 Luna’s pricing—$0.10 per million…
1 sourceSimon Willison -
Claude Code cuts sales prep to 5 minutes, code review to 3 minutes
Three recent case studies demonstrate how individuals and small teams are using Claude Code to drastically reduce time spent on routine tasks. AI Orchestra Co., Ltd. reported that a non-engineer CEO built a system…
1 sourcenote.com -
Anthropic's Claude Opus 5.5 may have been nerfed, users report
Claude Opus 5.5, Anthropic's flagship model released on September 22, 2026, has drawn a wave of user complaints over the past three days. Developers on X say the model now gives shorter answers, uses more tokens and…
1 sourceabz.global -
Anthropic releases Opus 5.5 and Sonnet 5.5; OpenAI launches GPT-6 Sol and Luna tiers
Anthropic released Opus 5.5 and Sonnet 5.5, with Opus 5.5 noted for lower prices, faster performance, strong benchmark results, a system card noting sandbox-tampering attempts, and expanded defender-focused…
6 sourcesnote.comLast Week in AIgeeky-gadgets.com -
LlamaIndex launches Extract v2.5 with higher accuracy and grounding
LlamaIndex announced the release of Extract v2.5 on October 1, 2026. The new version improves the F1 score of its three extraction tiers on the ExtractBench benchmark, moving the Cost Effective tier from 87.1 to 93.9,…
1 sourceUnite.AI -
Barclays integrates Anthropic’s Claude Opus 5.5 and Sonnet 5.5 globally
The move aims to improve operational efficiency and technological capabilities, leveraging Anthropic’s advanced and cost-effective models. Anthropic’s valuation stands at approximately $965 billion after recent funding…
2 sourcescryptobriefing.comnote.com -
Sonnet 5.5 matches Opus 5.5 on three tasks with the 1020 trick
YaroTech tested Sonnet 5.5 on three tasks using the same wording and the intentional typo '1020' as five days prior. The model showed similar performance to Opus 5.5 from that time, including correcting the defect rate…
1 sourcenote.com -
Anthropic cuts AI costs with faster, cheaper Claude Sonnet 5.5
Anthropic released Claude Sonnet 5.5, a model that claims 30% faster performance and up to 30% lower costs for routine tasks like coding and document creation. The update does not change token pricing—$2 per million…
31 sources HN 10note.comonline-tech-tips.comBen's Bitesfinance.yahoo.com +10 more -
Anthropic launches Claude Opus 5.5 with 40% lower costs and Fable 5.1-level performance
Anthropic has announced Claude Opus 5.5, a new AI model that delivers performance on par with Fable 5.1 for many tasks while reducing operational costs by 40% compared to the previous Opus 5 model. The model features…
19 sourcesgeeky-gadgets.comThe Rundown AILatent Spacenote.com +4 more
