Question 1

What is Claude Opus 4.1?

Accepted Answer

Claude Opus 4.1 is a model from Anthropic, released on Aug 5, 2025. Claude Opus 4.1 is an updated version of Anthropic’s flagship model, offering improved performance in coding, reasoning, and agentic tasks. It achieves 74.5% on SWE-bench Verified and shows notable gains in multi-file code refactoring, debugging precision, and detail-oriented reasoning. The model supports extended thinking up to 64K tokens and is optimized for tasks involving research, data analysis, and tool-assisted reasoning.

Question 2

How much does Claude Opus 4.1 cost?

Accepted Answer

On the Respan gateway, input starts at $15.00 per 1M tokens on OpenRouter, and output starts at $75.00 per 1M tokens on OpenRouter, after gateway discounts.

Question 3

Which providers serve Claude Opus 4.1 on Respan?

Accepted Answer

Claude Opus 4.1 is served by OpenRouter.

Question 4

What is Claude Opus 4.1's context window?

Accepted Answer

Claude Opus 4.1 accepts up to 200K tokens of context.

Question 5

How do I use Claude Opus 4.1 with the Respan gateway?

Accepted Answer

Point any OpenAI-compatible SDK at https://api.respan.ai/api/ with your Respan API key and set the model to "claude-opus-4.1". To set it up with a coding agent, copy the agent setup prompt at the top of this page.

Question 6

How fast is Claude Opus 4.1?

Accepted Answer

Over the last 30 days of requests through the Respan gateway, the fastest provider was OpenRouter at 3 tokens per second, and the lowest response latency was 4.1 seconds on OpenRouter. Speed varies with request size and provider.

Question 7

Where does Claude Opus 4.1 rank on the Respan Index?

Accepted Answer

Claude Opus 4.1 scores 29.0 out of 100 on the Respan Index v1.1, ranking #67 of 138 models. By category: Coding 8.8, Agents 51.1, Reasoning 17.7, Knowledge & language 21.3 (estimated), and Human preference 49.9. The Respan Index combines independent and lab-reported benchmark results into one score, using benchmark data collected by llmmetric.com.

Question 8

How does Claude Opus 4.1 score on benchmarks?

Accepted Answer

Claude Opus 4.1 has 16 published benchmark scores, including SWE-bench Verified 74.5%, GPQA Diamond 77.3%, and OTIS Mock AIME 2024-2025 68.9%. Each score links to where it was published; the data is collected by llmmetric.com.

Claude Opus 4.1

Providers

Pricing

Cost by volume

Throughput and latency

Output speed

Response latency

Certified where it counts.

Benchmarks

Respan Indexv1.1

Coding3

Reasoning5

Math5

Arena2

Other1

Apps

Claude Opus 4.1 FAQ

Works with your entire stack

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