Claude Opus 4.6

by Anthropic

Released 73 days after Claude Opus 4.5 · All Anthropic releases

Claude Opus 4.6 advances reasoning and coding, excelling at careful planning and sustaining agentic tasks across large codebases. It introduces a 1M token context window in beta and posts strong long-context retrieval results well above earlier Opus models. The model supports extended thinking for deeper reasoning and can generate up to 128K token outputs, completing larger tasks without splitting them across requests. Opus 4.6 performs strongly across professional domains including financial analysis, legal document review where it reaches 90.2% on BigLaw Bench, research synthesis, code review, and security vulnerability detection. New capabilities include agent teams in Claude Code and improved multi-step planning for spreadsheet work, with better instruction following and consistency. It maintains alignment comparable to its predecessor while showing a low rate of over-refusals among recent Claude models.

Call Claude Opus 4.6 on Opper with the OpenAI SDK. Sign up without a credit card. Get started

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Key info

Input
Output
Features
Context window
1M
Max output
128K
Input price
$5.00 /1M$0.50 cache read · $6.25 write
Output price
$25.00 /1M
Released
  • EU residency available
  • US residency available
  • Zero data retention on pay-as-you-go
  • No training by default
  • GDPR DPA available

Available routes

Claude Opus 4.6 runs on 3 different routes through the Opper gateway. Compare residency, zero data retention and training posture at a glance, with full data-handling detail per route below.

ProviderRegionZero data retentionTrainingInputOutputCache read
Anthropic
USNo$5.00$25.00$0.50$6.25 write
AWS Bedrock
EUNo$5.00$25.00$0.50$6.25 write
Google Cloud
MultiNo$5.00$25.00$0.50$6.25 write

Uptime and availability

Claude Opus 4.6 runs on 3 independently monitored routes through the Opper gateway. A direct integration leaves you on one of them, the gateway serves whichever is healthy.

100%effective uptime, last 30 days
Averaged across these routes on their own, a single provider reached 94.52% over the same window.
Daily status through the gateway, which serves each request from whichever route is healthy.
3 monitored providers serve Claude Opus 4.6.

Measured over the last 30 days from each provider's official status feed via StatusGator. Refreshed hourly. See uptime for every provider Opper monitors.

Data handling per route

Each route hosting Claude Opus 4.6 has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.

Anthropic — United States🇺🇸

Zero data retention with abuse monitoring: prompts and outputs are kept for abuse monitoring only, for a window the provider does not state, and are not used for training. No training on customer data. US; SCCs; DPA available.

Zero data retention
With abuse monitoring, window not stated.
Training
No training on customer data.
Logging
Abuse monitoring
Abuse monitoring
On by default, holds flagged content, 730 days, a person can view samples
Caching
Content cached for replay
GDPR DPA
DPA available
Transfer mechanism
SCCs

AWS Bedrock — Sweden🇸🇪

Zero data retention: nothing is logged, held for abuse monitoring or used for training. No training on customer data. EU; DPA available.

Zero data retention
Yes. Nothing is logged, held for abuse monitoring or used for training.
Training
No training on customer data.
Logging
None
Abuse monitoring
Always on, keeps nothing
GDPR DPA
DPA available
Transfer mechanism
Not applicable — data stays in EU

Google Cloud — Multi-region

Zero data retention with abuse monitoring: prompts and outputs are kept for abuse monitoring only, for a window the provider does not state, and are not used for training. No training on customer data. GLOBAL; SCCs; DPA available.

Zero data retention
With abuse monitoring, window not stated.
Training
No training on customer data.
Logging
Abuse monitoring
Abuse monitoring
On by default, holds flagged content, 90 days, a person can view samples
GDPR DPA
DPA available
Transfer mechanism
SCCs

Benchmarks

Independent benchmark scores — composite indices for reasoning, coding, and math, plus individual eval scores where available.

Global rank#126 of 664 LLMs
TierEfficient
Intelligence Index26.4
Reasoning & knowledge
GPQA Diamond
84%
Humanity's Last Exam
19%
Long-context reasoning
67%
Agentic & tool use
Terminal-Bench Hard
48%
τ²-Bench Telecom
85%
Math & instruction following
IFBench
45%
See full leaderboard →Benchmarks via Artificial Analysis · View on AA

Get started

Call Claude Opus 4.6 through the Opper gateway with one API key. Opper is drop-in compatible with the OpenAI, Anthropic and Google AI SDKs.

Claude Opus 4.6 is a premium model on Opper. Sign up needs no credit card: you get an API key straight away and the free models work in the playground and the API. Add a card to use premium models, pay-as-you-go with no minimum.

Set it up with your agent

Copy this and paste it into a coding agent like Claude Code, Cursor or Codex and it'll wire up Opper for you.

Or call it directly

import OpenAI from "openai";
const client = new OpenAI({
  apiKey: process.env.OPPER_API_KEY,
  baseURL: "https://api.opper.ai/v3/compat",
});
const completion = await client.chat.completions.create({
  model: "claude-opus-4-6",
  messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);

Compare Claude Opus 4.6 with…

Side-by-side on privacy, EU hosting, pricing, and benchmarks.

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