Which is cheaper, Claude Sonnet 4 or Composer 2 Fast?
As of August 20, 2026, Composer 2 Fast is 50% cheaper on blended LLM API pricing. Composer 2 Fast costs $1.50 per million input tokens and $7.50 per million output tokens ($9.00 blended 1M-in + 1M-out). Claude Sonnet 4 costs $3.00 / $15.00 per million tokens ($18.00 blended). Sources: https://platform.claude.com/docs/en/about-claude/pricing and https://cursor.com/docs/models/cursor-composer-2. The cheapest LLM for your app still depends on how many output tokens you generate.
How much does Claude Sonnet 4 vs Composer 2 Fast cost per million tokens?
Claude Sonnet 4 Claude API pricing from Anthropic is $3.00 input and $15.00 output per million tokens via Anthropic. Composer 2 Fast Cursor API pricing is $1.50 input and $7.50 output per million tokens via Cursor. Use those four numbers, not ChatGPT Plus or Claude Pro subscription prices, when you are comparing APIs.
Which is better for coding, Claude Sonnet 4 or Composer 2 Fast?
Claude Sonnet 4 has a published SWE-bench Verified score of 72.7%. Composer 2 Fast does not have that eval on this page yet.
What is the context window for Claude Sonnet 4 vs Composer 2 Fast?
Claude Sonnet 4 supports a 200K token context window, while Composer 2 Fast supports 200K tokens. Both models have the same context window size. Filling a larger window bills more input tokens, so the cheaper-per-million model can still cost more on long documents.
Which model performs better on benchmarks, Claude Sonnet 4 or Composer 2 Fast?
Shared benchmark scores for Claude Sonnet 4 and Composer 2 Fast are still limited. Check the comparison table for the evals each model has published. Check the comparison table for GPQA Diamond, SWE-bench, MMLU, HLE, and the other evals we track. Token price and benchmark score together are the usual LLM comparison, not either number alone.
Is Claude Sonnet 4 or Composer 2 Fast better for production use?
Both Claude Sonnet 4 and Composer 2 Fast are production API models. For cost-sensitive production traffic, Composer 2 Fast has better economics on the blended 1M-in + 1M-out scale. For maximum capability, weight the benchmark table for your domain. Many production stacks route cheap models for drafts and a frontier model for the hard turn, which is usually cheaper than sending everything to the expensive API.
Can I switch between Claude Sonnet 4 and Composer 2 Fast in my app?
Yes. Call Claude Sonnet 4 through Anthropic and Composer 2 Fast through Cursor with separate API keys, or through a gateway that already wraps both. Keep prompts in tokens, not characters, when you estimate the invoice. AnotherWrapper templates can swap providers without rewriting auth and billing.
How accurate is this Claude Sonnet 4 vs Composer 2 Fast pricing data?
List rates are the latest published Claude API pricing from Anthropic and Cursor API pricing, quoted per million tokens. Official rate sheets: https://platform.claude.com/docs/en/about-claude/pricing and https://cursor.com/docs/models/cursor-composer-2. Prompt caching, batch APIs, and committed-use discounts can change the invoice. Benchmark scores are from official publications and independent evals, updated as new numbers land.
What is the output token limit for Claude Sonnet 4 and Composer 2 Fast?
Claude Sonnet 4 supports up to 64K output tokens per request, while Composer 2 Fast supports up to an unspecified number of output tokens. Output tokens are usually the expensive half of API pricing, so a higher max output cap is a capability, not a discount.
Which model has better throughput, Claude Sonnet 4 or Composer 2 Fast?
Claude Sonnet 4 has a measured throughput of approximately 101 tokens/second. Throughput data for Composer 2 Fast is not yet available. Throughput (tokens per second) and time-to-first-token are why two models with the same per-million-token price can still feel different in chat and agents.
How do I switch the models in this Claude Sonnet 4 vs Composer 2 Fast comparison?
Use the model pickers at the top of this LLM comparison. Search any model in the index and the URL updates. Open Claude Sonnet 4 or Composer 2 Fast from the sidebar for the single-model API pricing page, or go back to the LLM pricing table to sort by cheapest blended cost.
