Claude Haiku 4.5 by Anthropic is the first Haiku model with extended thinking, context awareness, and computer use - designed for sub-agent roles and real-time agentic workflows.
Capabilities, design details, and architectural traits
Claude Haiku 4.5 is Anthropic's fastest and most efficient model in the 4.5 family. It is the first model in the Haiku line to support extended thinking, context awareness, and computer use - three capabilities previously exclusive to Sonnet and Opus tiers. This makes it a structurally different model from all prior Haiku releases, not just a faster version of the same design.
| Differentiator | Detail |
|---|---|
| Extended thinking - first for Haiku tier | Supports interleaved thinking between tool calls, summarized thinking output, and configurable thinking token budgets; prior Haiku models had no extended thinking mode |
| Context awareness | Receives real-time token budget updates after each tool call, enabling the model to track remaining context window and avoid premature task abandonment during long-running agent sessions |
| Computer use | Surpasses Sonnet 4 on computer-use tasks; Haiku 3.5 did not support computer use |
| Documented sub-agent role | Officially positioned for multi-agent systems where a Sonnet model orchestrates and multiple Haiku 4.5 instances execute parallel subtasks |
| ASL-2 classification | Released under AI Safety Level 2 - lower than Sonnet 4.5 and Opus 4.1 (ASL-3), reflecting different CBRN risk profile |
| Drop-in replacement scope | Serves as a direct replacement for both Haiku 3.5 and Sonnet 4 at Haiku pricing |
Haiku 4.5 is not an incremental update to Haiku 3.5 - it introduces a new capability baseline for the Haiku class. Extended thinking, context awareness, and computer use each represent features Haiku 3.5 entirely lacked. The combination changes which workloads the Haiku tier can handle without escalating to a larger model, particularly for parallel agent execution and real-time computer-driven tasks.
Independent evaluations · Artificial Analysis
Evaluate specifications, pricing, and independent benchmark indices
| Model Details | |||
|---|---|---|---|
| General Info | |||
| Provider | Anthropic | Anthropic | Anthropic |
| Release Date | October 15, 2025 | July 24, 2026 | June 9, 2026 |
| Knowledge Cutoff | - | May 2026 | - |
| Context & Limits | |||
| Context Window | 200K | 1M Best Context Window | 1M Best Context Window |
| Pricing (per 1M tokens) | |||
| Input Pricing | $1 Best Input Pricing | $5 | $10 |
| Output Pricing | $5 Best Output Pricing | $25 | $50 |
| Modalities | |||
| Inputs | textimagefile | textimage | textimagefile |
| Outputs | text | text | text |
| Benchmarks (0-100) | |||
| Intelligence Index | 24.1 | 63.1 Best Intelligence Index | 62.1 |
| Coding Index | - | 78.0 Best Coding Index | 76.5 |
| Agentic Index | - | 59.2 Best Agentic Index | 56.6 |
Graduate-level reasoning and expert Q&A evaluation.
Extremely difficult logical reasoning and knowledge.
Logical reasoning over long context windows.
Independent evaluation data provided by Artificial Analysis. To view the latest benchmarks and full details, visit their official site.
