Question 1

What is Claude Opus 4?

Accepted Answer

Claude Opus 4 is a model from Anthropic, released on May 22, 2025. Claude Opus 4 is benchmarked as the world’s best coding model, at time of release, bringing sustained performance on complex, long-running tasks and agent workflows. It sets new benchmarks in software engineering, achieving leading results on SWE-bench (72.5%) and Terminal-bench (43.2%). Opus 4 supports extended, agentic workflows, handling thousands of task steps continuously for hours without degradation. Read more at the blog post here.

Question 2

How much does Claude Opus 4 cost?

Accepted Answer

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

Question 3

Which providers serve Claude Opus 4 on Respan?

Accepted Answer

Claude Opus 4 is served by Bedrock.

Question 4

What is Claude Opus 4's context window?

Accepted Answer

Claude Opus 4 accepts up to 200K tokens of context.

Question 5

How do I use Claude Opus 4 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". To set it up with a coding agent, copy the agent setup prompt at the top of this page.

Question 6

Where does Claude Opus 4 rank on the Respan Index?

Accepted Answer

Claude Opus 4 scores 20.0 out of 100 on the Respan Index v1.1, ranking #96 of 138 models. By category: Coding 8.4, Agents 21.9 (estimated), Reasoning 14.2, Knowledge & language 18.6 (estimated), and Human preference 46.6. The Respan Index combines independent and lab-reported benchmark results into one score, using benchmark data collected by llmmetric.com.

Question 7

How does Claude Opus 4 score on benchmarks?

Accepted Answer

Claude Opus 4 has 12 published benchmark scores, including SWE-bench Verified 72.5%, GPQA Diamond 76.3%, and MATH Level 5 85%. Each score links to where it was published; the data is collected by llmmetric.com.

Claude Opus 4

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Pricing

Cost by volume

Certified where it counts.

Benchmarks

Respan Indexv1.1

Coding5

Reasoning2

Math3

Arena2

Apps

Claude Opus 4 FAQ

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