What is the context length of Claude Opus 4.6?

Claude Opus 4.6 has a 1,000,000 token context window. It supports up to 128,000 completion tokens.

Does Claude Opus 4.6 support tool calling and structured outputs?

Yes. Claude Opus 4.6 accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

What inputs and outputs does Claude Opus 4.6 support?

Claude Opus 4.6 accepts text, images and files such as PDFs as input and returns text.

Which providers serve Claude Opus 4.6?

Claude Opus 4.6 is served by 5 providers on OpenRouter: Amazon Bedrock, Azure, Google Vertex (Europe), Anthropic and Claude Platform on AWS. Requests are routed to the best available provider, with automatic failover to the others, and you can pin or exclude providers with provider routing.

When was Claude Opus 4.6 released?

Claude Opus 4.6 was released on February 4, 2026.

Anthropic: Claude Opus 4.6

Name: Anthropic: Claude Opus 4.6
Author: anthropic

anthropic/claude-opus-4.6

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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(opens in new tab)

Modalities

In / Out Price

$5 / $25per 1M

Context

Released

Feb 4, 2026

About Anthropic: Claude Opus 4.6

OpenRouter makes Anthropic: Claude Opus 4.6 available through a unified, OpenAI-compatible API using the model ID anthropic/claude-opus-4.6. Requests can be routed across 5 providers, including Amazon Bedrock, Azure, Google Vertex (Europe), Anthropic and Claude Platform on AWS, with automatic failover when an endpoint is unavailable.

Anthropic: Claude Opus 4.6 accepts text, images and files such as PDFs and returns text. It has a 1,000,000-token context window and a maximum output of 128,000 tokens.

On OpenRouter, Anthropic: Claude Opus 4.6 costs $5.00/M input tokens and $25.00/M output tokens, with separate rates for Cache Read at $0.50/M tokens, Cache Write at $6.25/M tokens and Cache Write (1h) at $10.00/M tokens. Effective pricing can be lower when prompt caching applies. It was released on February 4, 2026.

More models from Anthropic

Providers

Different companies host the same model. OpenRouter routes your request to one of them based on the routing mode you pick — Balanced (price + speed), Nitro (fastest), or Exacto (highest tool-calling accuracy).

Latency / throughput


$5.00	$25.00	$0.50	1.53s	31 tps	99.94%
$5.00	$25.00	$0.50	2.64s	44 tps	100.00%
$5.00	$25.00	$0.50	2.32s	34 tps	100.00%
$5.00	$25.00	$0.50	3.71s	32 tps	99.82%
$5.00	$25.00	$0.50	3.07s	28 tps	99.67%
$5.50	$27.50	$0.55	2.23s	42 tps	100.00%

Performance

Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better).

Throughput

44tok/s

P50, best across providers

Latency

1.53s

P50, best provider

Latency / throughput

AutoExacto Benchmarks

GPQA DiamondTAU-Bench

Claude Platform on AWS

86.1%78.3%

auto-routing

86.0%77.9%

Amazon Bedrock

85.8%77.9%

Azure

85.2%77.4%

Google Vertex (Europe)

84.0%77.8%

Google Vertex

84.1%77.2%

Anthropic

83.6%76.9%

+1 more providers

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Uptime (3d)

100.00%

Availability (3d)

99.98%

Availability over the last 3 days

Last 72 hours

Availability 99.98%

3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability

99.97%

Without Routing

98.16%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and customization options.

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

Sahasra

All-in-one creator store

108Btokens

Claude Code

Claude Code is Anthropic's agentic coding tool that reads your entire codebase, plans and executes changes across files, runs tests, and iterates on failures, all from natural language prompts.

99.6Btokens

Hermes Agent

Hermes Agent is an open-source, self-improving AI agent by Nous Research that runs persistently with memory across sessions, and builds reusable skills from experience. It comes with 40+ built-in tools, including web search, browser automation, and vision, plus scheduled automations and subagents.

57Btokens

OpenClaw

OpenClaw is an open-source AI agent that connects to your messaging apps and takes real actions on your behalf, from running commands and browsing the web to managing files and sending emails.

57Btokens

Lemonade

The AI tool for Roblox games.

17.8Btokens