Anthropic launches Claude Sonnet 5.5 with 30% faster speed and 30% lower cost
Anthropic released Claude Sonnet 5.5 on September 29, claiming 30% faster speed and up to 30% lower task costs versus Sonnet 5. The mid-tier model scored 70.6% on Terminal-Bench 4.0, up from 10.3%, and 56 on the Artificial Analysis Intelligence Index. Pricing remains at $2/$10 per million input/output tokens. Available on Claude platform, AWS, Google Cloud, and Azure.
IllustrationEditorial responsibility
- No named human review is recorded for this page.
- Reports are grouped by semantic similarity and deterministic rules. Language models may assist titles, summaries, translation and cross-source analysis; the page reads the event directly, while its address stays stable when the title changes.
- Summary covers the current reports
Cross-source coverage
Reporting timeline
Anthropic launches Claude Sonnet 5.5 on OpenRouter with 30% speed and cost improvements
Anthropic has released Claude Sonnet 5.5, now available on the OpenRouter platform. According to the announcement, the new model is significantly smarter than its predecessor Sonnet 5 and produces much clearer writing. Additionally, Sonnet 5.5 is reported to be 30% faster and approximately 30% cheaper for most workloads compared to the previous version. The post includes a link to the OpenRouter service where the model is live.
Read sourceAnthropic releases Claude Sonnet 5.5 with 70.6% Terminal-Bench score, 30% cost reduction
Anthropic has released Claude Sonnet 5.5, achieving a 70.6% score on Terminal-Bench 4.0, a significant jump from Sonnet 5's 10.3%. The new model maintains the same pricing at $2 per million input tokens and $10 per million output tokens, but delivers a 30% overall cost reduction per task due to faster speeds and fewer tool calls. Output arrives more than 30% faster than Sonnet 5, making it Anthropic's fastest Sonnet model. Users can adjust an effort setting, trading longer reasoning for higher cost per task. At Low or Medium effort, Sonnet 5.5 exceeds Sonnet 5's top score at about one-tenth the cost per task. On FrontierCode, Sonnet 5.5 at High effort scores roughly 10 points above Sonnet 5 at the same setting while costing approximately one-fifteenth as much per task. Anthropic characterizes Sonnet 5.5 as ideal for well-defined routine work such as software debugging, coding, document production, building presentations and spreadsheets, and designing or refining interfaces.
Read sourceAnthropic launches Claude Sonnet 5.5, scoring 56 on Intelligence Index, 2 points behind Opus 5.5
Anthropic has launched Claude Sonnet 5.5, a new AI model that scores 56 on the Artificial Analysis Intelligence Index, just 2 points behind the top-scoring Opus 5.5. At its max effort setting, Sonnet 5.5 gains 18 points over its predecessor Sonnet 5 and ranks #2 on the Intelligence Index. The model is priced identically to Sonnet 5 at $0.2/$2/$10 per 1M cache input/input/output tokens, but outputs a higher number of Output Tokens per Task, costing $7.60 per task (~50% higher than Sonnet 5). Key benchmarks show Sonnet 5.5 reaching parity with Opus 5.5 on agentic terminal use (Terminal-Bench 4.0: 64% vs 60%), knowledge work (AA-Briefcase, GDPval-AA, AutomationBench-AA), but with significantly higher token usage. At max effort, it used ~193k Output Tokens per Intelligence Index Task, the highest measured, ~60% higher than Opus 5.5 (max) and ~7x GPT-6 Astra (max). The model lags behind Opus 5.5 on factual knowledge (54% vs 66% factual accuracy) and scientific reasoning (6 points lower on Humanity's Last Exam and SciCode). The evaluations were conducted on a pre-release deployment with a bug affecting structured outputs, which Anthropic has fixed for public release. The model retains a 1 million token context window and offers five effort settings.
Read sourceShow 7 older updatesHide older updates
Anthropic Releases Claude Sonnet 5.5, Scores 56 on Artificial Analysis Intelligence Index
Anthropic has released Claude Sonnet 5.5, a new AI model. According to a post on X by Artificial Analysis (@ArtificialAnlys), the model scored 56 points on the Artificial Analysis Intelligence Index. This score is only 2 points lower than the top score of Opus 5.5 (max). In max effort mode, Claude Sonnet 5.5 outperforms its predecessor, Sonnet 5, by 18 points. Artificial Analysis uses its own benchmark to break down the trade-off between performance and token cost, providing a quantifiable reference for model selection.
Read sourceAnthropic Launches Claude Sonnet 5.5 with 30% Faster Speed and 30% Lower Cost
On September 29, Anthropic announced the release of its new AI model, Claude Sonnet 5.5. The company claims the model operates over 30% faster than its predecessor, Sonnet 5, and can reduce task execution costs by up to 30%. Positioned as a mid-tier model in the Claude 5.5 series, Sonnet 5.5 is designed for everyday tasks such as code fixes, document creation, presentations, and spreadsheet work. Anthropic reported significant performance improvements across multiple tests, notably scoring 70.6% on the Terminal-Bench 4.0 code test, compared to Sonnet 5's 10.3%. The model also features enhancements in long-cycle tasks, image understanding, and knowledge work. Pricing remains unchanged from Sonnet 5 at $2 per million input tokens and $10 per million output tokens, with cached reads at $0.2 per million tokens, but Anthropic states that efficiency gains can lower actual task costs by up to 30%. Sonnet 5.5 includes upgraded security measures, marking the first time the Sonnet series has adopted cybersecurity protections similar to high-performance models. The model is available on the Claude platform and via Amazon Web Services (AWS), Google Cloud, and Microsoft Azure.
Read sourceAnthropic Launches Claude Sonnet 5.5 AI Model with 30% Speed Boost and Cost Reduction
On September 29, Anthropic released its new AI model, Claude Sonnet 5.5, claiming it offers over 30% faster operation and up to 30% lower task costs compared to its predecessor, Sonnet 5. Positioned as a mid-range model in the Claude 5.5 series, Sonnet 5.5 is designed for daily tasks such as coding, document creation, presentations, and spreadsheets. Anthropic reported significant performance improvements in various tests, including a score of 70.6% on the Terminal-Bench 4.0 coding benchmark, up from Sonnet 5's 10.3%. The model also features enhancements in long-cycle tasks, image understanding, and knowledge work. Pricing remains unchanged from Sonnet 5 at $2 per million input tokens and $10 per million output tokens, with cached reads at $0.2 per million tokens, but Anthropic states that efficiency gains can reduce actual task costs by up to 30%. The model includes upgraded safety features, marking the first time the Sonnet series has adopted cybersecurity protections similar to high-performance models. Claude Sonnet 5.5 is now available on the Claude platform and supports Amazon Web Services, Google Cloud, and Microsoft Azure.
Read sourceAnthropic officially announces Claude Sonnet 5.5, claiming 30% faster and 30% cheaper performance
Anthropic has officially announced the release of Claude Sonnet 5.5, a new AI model that the company claims is 30% faster and 30% cheaper than its predecessor, with performance close to the more advanced Opus 5.5 model. The announcement positions Claude Sonnet 5.5 as a potential new default option for users, offering improved efficiency and cost-effectiveness. The post, shared on X by the account testingcatalog, highlights the model's competitive pricing and speed advantages, suggesting it may become a go-to choice for AI applications. No specific release date or pricing details were provided beyond the percentage improvements. The announcement underscores Anthropic's ongoing efforts to enhance its AI product lineup and compete in the rapidly evolving AI market.
Read sourceAnthropic launches Claude Sonnet 5.5 with 30% faster speed and up to 30% lower cost
Anthropic announced the launch of Claude Sonnet 5.5, a new AI model that is 30% faster and costs up to 30% less than its predecessor, Sonnet 5, for most tasks. The model is described as strong for well-scoped everyday tasks such as fixing bugs, creating documents, and slides. The announcement was made via a post on X by addyosmani, who also referenced a demonstration by @RLanceMartin where models painted the same photo in code to show the improvement. The post includes a link to a visual comparison of the models' outputs.
Read sourceAnthropic Releases Claude Sonnet 5.5, Over 30% Faster Than Sonnet 5
Anthropic has released Claude Sonnet 5.5, a new AI model that runs over 30% faster than its predecessor, Sonnet 5. The model features clearer writing and is designed for rapid back-and-forth interactions. It is positioned as distinct from the Claude Opus 5.5 model, which is built for complex judgment tasks. Sonnet 5.5 specializes in well-defined daily tasks such as bug fixing, and creating documents, slides, and tables. The model is available immediately to all users. Additionally, Anthropic announced that Claude Haiku 5.5 will join the series in the coming weeks.
Read sourceClaude Sonnet 5.5: New AI model runs 30% faster, costs 30% less than Sonnet 5
Anthropic's ClaudeAI account announced the release of Claude Sonnet 5.5, the second model in the Claude 5.5 family. According to the announcement, the new model is a clear upgrade over its predecessor, Sonnet 5, delivering more than 30% faster performance while costing up to 30% less for most workloads. The post includes a link to further details. The announcement positions the model as a more efficient and cost-effective option within the Claude 5.5 lineup.
Read source