Question 1

What is Claude Opus 4.6?

Accepted Answer

Claude Opus 4.6 is a model from Anthropic, released on Feb 5, 2026. Opus 4.6 is Anthropic’s strongest model for coding and long-running professional tasks. It is built for agents that operate across entire workflows rather than single prompts, making it especially effective for large codebases, complex refactors, and multi-step debugging that unfolds over time. The model shows deeper contextual understanding, stronger problem decomposition, and greater reliability on hard engineering tasks than prior generations. Beyond coding, Opus 4.6 excels at sustained knowledge work. It produces near-production-ready documents, plans, and analyses in a single pass, and maintains coherence across very long outputs and extended sessions. This makes it a strong default for tasks that require persistence, judgment, and follow-through, such as technical design, migration planning, and end-to-end project execution. For users upgrading from earlier Opus versions, see our official migration guide here.

Question 2

How much does Claude Opus 4.6 cost?

Accepted Answer

On the Respan gateway, input starts at $5.00 per 1M tokens on every provider, and output starts at $25.00 per 1M tokens on every provider, after gateway discounts.

Question 3

Which providers serve Claude Opus 4.6 on Respan?

Accepted Answer

4 providers serve Claude Opus 4.6: Anthropic, OpenRouter, Perplexity, and Google Vertex AI. Perplexity and Google Vertex AI require your own provider API key (BYOK).

Question 4

What is Claude Opus 4.6's context window?

Accepted Answer

Claude Opus 4.6 accepts up to 1M tokens of context on its largest provider route.

Question 5

How do I use Claude Opus 4.6 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 "anthropic/claude-opus-4-6". 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 4.6?

Accepted Answer

Over the last 30 days of requests through the Respan gateway, the fastest provider was OpenRouter at 13 tokens per second, and the lowest response latency was 1.8 seconds on OpenRouter. Speed varies with request size and provider.

Question 7

Where does Claude Opus 4.6 rank on the Respan Index?

Accepted Answer

Claude Opus 4.6 scores 42.1 out of 100 on the Respan Index v1.1, ranking #41 of 138 models. By category: Coding 26.8, Agents 55.7, Reasoning 34.5, Knowledge & language 47.3, and Human preference 54.1. 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 4.6 score on benchmarks?

Accepted Answer

Claude Opus 4.6 has 42 published benchmark scores, including SWE-bench Verified 80.8%, Tau2-bench Telecom 99.3%, and GPQA Diamond 91.3%. Each score links to where it was published; the data is collected by llmmetric.com.

Provider	Context	Input	Output
Anthropic`anthropic/claude-opus-4-6`	200K	$5.00/M	$25.00/M
OpenRouter`openrouter/anthropic/claude-opus-4.6`	1M	$5.00/M	$25.00/M
PerplexityBYOK only`perplexity/anthropic/claude-opus-4-6`	200K	$5.00/M	$25.00/M
Google Vertex AIBYOK only`vertex_ai/claude-opus-4-6@default`	200K	$5.00/M	$25.00/M

Claude Opus 4.6

Providers

Certified where it counts.

Pricing

Cost by volume

Throughput and latency

Output speed

Response latency

Benchmarks

Respan Indexv1.1

Coding6

Apps

Claude Opus 4.6 FAQ

Works with your entire stack

Built for AI agents.
Break less.
Ship more.

Agents8

Reasoning9

Math7

Knowledge5

Multimodal3

Arena3

Other1