Anthropic: Claude Sonnet 4.5
Analysis Summary
Claude Sonnet 4.5 is Anthropic's mid-cycle Sonnet release, combining a coding index of 52.1 with an agentic index of 56.8 and an intelligence index of 36.4. It supports vision, file input, tool use, and function calling across a 1M token context window, making it one of the most capable all-round models in this batch. Its GPQA of 0.834 and MMLU-Pro of 0.875 confirm strong general reasoning, while its tau2 of 0.781 indicates reliable multi-step task execution.
For businesses, Claude Sonnet 4.5 is well suited to autonomous coding agents, long-document analysis, client-facing content generation, and complex agentic pipelines. The 1M context window allows entire codebases or large contracts to be processed in a single call. Instruction following (ifbench 0.573) and long-context reasoning (lcr 0.657) are above average for this tier.
At $3 input / $15 output per 1M tokens, it is priced at a premium but delivers broad capability breadth. Teams that need a single model covering coding, reasoning, vision, and agentic tasks will find it a strong fit, particularly given Anthropic's reliability and enterprise support.
Assessed July 10, 2026
Editorial notes
Claude Sonnet 4.5 from Anthropic delivers a coding index of 52.1, strong agentic performance, vision and file support, and a 1M token context window for demanding business workflows.
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
DFO Verdict
Claude Sonnet 4.5 from Anthropic delivers a coding index of 52.1, strong agentic performance, vision and file support, and a 1M token context window for demanding business workflows.
Benchmark scores
Magenta = intelligence Ā· Ink = technical/agentic Ā· Cyan = content & long-context Ā· Grey = community benchmarks. Data: Artificial Analysis, Hugging Face.
36.4 Intelligence IndexĀ·52.1 Coding IndexĀ·56.8 Agentic IndexĀ·88 Math Index
How Anthropic: Claude Sonnet 4.5 compares
Anthropic: Claude Sonnet 4.5 ranks #54 of 393 AI models we track for overall intelligence, #35 of 157 for coding, #60 of 300 for agentic tasks. Its 1M-token context window is larger than 90% of the models we list. At $3.00 per million input tokens it is cheaper than 11% of comparable models.
Dark bar = input Ā· light bar = output, scaled to the priciest peer.
1M tokens ā 8 full-length novels or ~2,500 pages of business documents in a single request.
Strongest on content. The pulled-in intelligence corner is the trade-off, and if the shape matters more than the price, this is your model.
Compare shapes side-by-side āPricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $3.00 | $0.003000 |
| Output | $15.00 | $0.015000 |
What would Anthropic: Claude Sonnet 4.5 cost your business?
Pick the job that looks most like yours, then fine-tune with the sliders. Estimates update live.
A website chatbot handling around 100 customer conversations a day, a few short messages each.
Full calculator with 612 models ā Price Calculator
These numbers get smaller with the right architecture.
We route routine calls to cheap models and save Anthropic: Claude Sonnet 4.5 for the hard ones. Most clients cut their estimate by 60-80%.
Talk to our teamAbout Anthropic: Claude Sonnet 4.5
Claude Sonnet 4.5 is Anthropicās most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with..
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Frequently asked questions about Anthropic: Claude Sonnet 4.5
How much does Anthropic: Claude Sonnet 4.5 cost?
Anthropic: Claude Sonnet 4.5 costs $3.00 per million input tokens and $15.00 per million output tokens.
What is the context window of Anthropic: Claude Sonnet 4.5?
Anthropic: Claude Sonnet 4.5 has a context window of 1,000,000 tokens (1M).
Is Anthropic: Claude Sonnet 4.5 good for coding?
On our coding benchmark index, Anthropic: Claude Sonnet 4.5 ranks #35 of 157 models, placing it in the top quartile of the field for code generation and debugging.
What can Anthropic: Claude Sonnet 4.5 do?
Anthropic: Claude Sonnet 4.5 supports image/vision input, tool use, and function calling.
Who created Anthropic: Claude Sonnet 4.5?
Anthropic: Claude Sonnet 4.5 is developed by Anthropic and was released on September 29, 2025.
