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                    "Introducing Claude Haiku 5.5: the cheapest, fastest, and most capable small model we\u2019ve ever released.Claude Haiku 5.5 is designed for high-volume, cost-sensitive tasks. It reliably handles quick and repetitive workloads (like summaries, compactions, database queries, and classification requests). It pairs well with Opus 5.5 and Sonnet 5.5 as a subagent on coding work. And, since it\u2019s also our fastest model to date, it works especially well for speed-sensitive tasks like live customer support and browser use.\u00b9Haiku 5.5 is available at a much lower price than Haiku 4.5. On average, it now costs around 75% less to run.\u00b2Along with this launch, we\u2019re making improvements to the value of our model range. We\u2019re halving the price of Claude Sonnet 5.5\u2019s cache reads, which means Sonnet 5.5 now runs around 20% cheaper on most agentic work. And we\u2019re introducing a new monthly API credit for our Claude Max and Team subscribers, designed to support our users in building new agents and applications that run on the Claude Platform.PerformanceHere\u2019s how Claude Haiku 5.5 performs across a range of benchmarks:Haiku 5.5Haiku 4.5GPT-6 LunaSonnet 5.5For referenceKnowledge workGDPval-AA v2.1162073514371840Knowledge workAA-Briefcase v1.1157861413361824Computer useOSWorld 2.172.4%Offline subset15.7%Offline subset48.9%Offline subset83.9%Offline subsetMultidisciplinary reasoningHumanity\u2019s Last Exam45.9%no tools10.2%no tools\u201456.9%no tools57.4%with tools18.7%with tools\u201464.5%with toolsAgentic codingTerminal-Bench 4.039.2%0.0%16.4%70.6%Agentic codingFrontierCode 1.1 (Main)46.4%\u201442.4%52.1%XhighVisual reasoningChartography46.4%no tools6.4%no tools29.1%no tools61.6%no toolsFor details on how we run our evaluations, see the Haiku 5.5 System Card.Haiku 5.5 is our first Haiku-class model to come with an adjustable effort setting. This means that, as with our other models, users can decide whether to optimize for cost or intelligence. The charts below show how Haiku 5.5 performs on three benchmarks at each effort setting:OSWorld 2.1 (offline subset)Accuracy vs. cost0102030405060708090Partial-credit score (%)0.050.100.200.50125Cost per attempt (USD, log scale)OSWorld 2.1 measures how well agents can operate a real computer to finish long, multi-step tasks.In early testing, our customers reported results consistent with the performance and cost improvements shown above. Here\u2019s what they told us about the new model:Quote\u201cWe\u2019re very impressed with Claude Haiku 5.5, particularly its speed. We ran it through our eval suite for AI Teammates, our AI agent product, covering use cases like triaging bugs, setting up projects, and searching large portfolios to surface high-risk or overdue work. Compared with the model we use today, we saw over a 30% reduction in latency for task completions and up to 2.5x faster inference per agent turn. It\u2019s a noticeably snappier experience.\u201dCompanyAsanaAuthorAaron Vinh, Staff Software EngineerPricingThe table below shows how Claude Haiku 5.5\u2019s pricing compares to our other models. Haiku 5.5 is especially good value when used for tasks with prompts up to 100,000 tokens, which make up around 90% of requests to our previous Haiku model.Price per 1\u00a0million tokensHaiku 5.5prompts up to / over 100kHaiku 4.5Sonnet 5.5Cache reads$0.01 / $0.05$0.10$0.10Cache writes$0.125 / $0.625$1.25$2.50Input tokens$0.10 / $0.50$1.00$2.00Output tokens$0.50 / $2.50$5.00$10.00SafetyAlignment. Claude Haiku 5.5 shows major improvements across almost all of our alignment evaluations relative to Haiku 4.5. In particular, we found far fewer instances of misaligned behavior, and a lower willingness to cooperate with misuse. The model\u2019s system card describes our evaluation process and results in more detail.Safeguards. Consistent with its capabilities, Haiku 5.5\u2019s cybersecurity safeguards are more restrictive than Haiku 4.5\u2019s, but somewhat less restrictive than those we\u2019ve applied to other recent models. In cybersecurity, they permit a wider range of defensive tasks than our safeguards for Sonnet 5.5, but they still block penetration testing and other techniques more likely to be used by attackers.Haiku 5.5\u2019s biology safeguards are the same as for Sonnet 5, Sonnet 5.5, and Opus 5. They allow research biology questions but restrict access to requests that we judge as likely to cause harm. Organizations working on wider-ranging biology and cyber activities can apply to our Life Sciences Verification Program and Cyber Verification Program.AvailabilityClaude Haiku 5.5 is available now on all platforms, including Amazon Web Services, Google Cloud, and Microsoft Azure. On the Claude Platform, developers can get started with claude-haiku-5-5. See our migration guide for details.Further updatesAlongside our new pricing for Claude Haiku 5.5, we\u2019re making further improvements to the value of our models and products.First, starting today, we\u2019re lowering the price of cache reads on Claude Sonnet 5.5. Cache reads now cost 50% less: $0.10 per million tokens rather than $0.20. Because cache reads make up a large share of models\u2019 token consumption, this reduces the cost of Sonnet 5.5 on most agentic tasks by around 20%.For instance, here\u2019s what the price cut means for Sonnet 5.5\u2019s performance relative to cost on Terminal-Bench 4.0:Terminal-Bench 4.0Accuracy vs. cost010203040506070Score (pass@1, %)0.5012510Cost per attempt (USD, log scale)Terminal-Bench 4.0 measures how well a model can complete complex, multi-step professional tasks within a command-line interface.This chart illustrates an important difference between Haiku 5.5 and our larger models. Sonnet 5.5 and Opus 5.5 remain better choices for complex agentic coding tasks like those measured by Terminal-Bench 4.0. By contrast, Haiku 5.5 is best suited to more narrowly scoped tasks that might otherwise have been cost-prohibitive with previous versions of Claude\u2014like compaction, summarization, or subagent work.Second, this week, we\u2019ll roll out a new monthly API credit to all Max and Team subscribers for use on the Claude Platform. Max 5x users will get $100 in credits per month, Max 20x users will get $200, and Team subscribers will receive up to $500, pooled across their users. These credits are designed to allow our users to experiment with building tools, apps, and agents that call our API. They can be used on any of our models. For more information, see our Help Center article.For developers, we\u2019re also updating our Claude Python and TypeScript SDKs to add support for computer use and browser use in beta. Haiku 5.5 is especially well-suited to these tasks, given its combination of speed, capability, and price. You can read more about this in our Claude Platform docs."
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