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Favicon for anthropic

Anthropic: Claude Opus 4.1

anthropic/claude-opus-4.1

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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.

Modalities

In / Out Price

$15 / $75per 1M

Context

200K

Released

Aug 5, 2025

Knowledge Cutoff

Jan 2025

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ProvidersPricingPerformanceUptimeBenchmarksAppsActivityFAQExplore

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), Floor (cheapest), or Exacto (highest tool-calling accuracy).

Pricing

The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.

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).

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.

Benchmarks

Scores on standardized evaluations. Higher percentages are better — and rank percentile shows where this model lands among all models on OpenRouter.

Benchmark score summary for Anthropic: Claude Opus 4.1 (Artificial Analysis and Design Arena)
SourceBenchmarkScore
Artificial AnalysisClaude 4.1 Opus (Reasoning) GPQA Diamond80.9%
Artificial AnalysisClaude 4.1 Opus (Reasoning) HLE12.5%
Artificial AnalysisClaude 4.1 Opus (Reasoning) IFBench55.4%
Artificial AnalysisClaude 4.1 Opus (Reasoning) τ²-Bench Telecom71.4%
Artificial AnalysisClaude 4.1 Opus (Reasoning) AA-LCR76.0%
Artificial AnalysisClaude 4.1 Opus (Reasoning) CritPt0.0%
Artificial AnalysisClaude 4.1 Opus (Reasoning) Terminal-Bench Hard34.3%
Design ArenaClaude Opus 4.1 Models Arena 3D Elo1182
Design ArenaClaude Opus 4.1 Models Arena Asciiart Elo1185
Design ArenaClaude Opus 4.1 Models Arena Code Categories Elo1179
Design ArenaClaude Opus 4.1 Models Arena Data Visualization Elo1176
Design ArenaClaude Opus 4.1 Models Arena Game Development Elo1187
Design ArenaClaude Opus 4.1 Models Arena SVG Elo1132
Design ArenaClaude Opus 4.1 Models Arena UI Component Elo1172
Design ArenaClaude Opus 4.1 Models Arena Website Elo1176

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.

Activity

Token volume and request traffic to this model over time.

Quick Start

Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.

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Frequently asked questions

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.

Claude Opus 4.1 costs $15.00/M input tokens and $75.00/M output tokens, with separate rates for Cache Read at $1.50/M tokens, Cache Write at $18.75/M tokens, and Cache Write (1h) at $30.00/M tokens.

Claude Opus 4.1 has a 200,000 token context window. It supports up to 32,000 completion tokens.

Yes. Claude Opus 4.1 accepts tools and tool_choice for function calling. It does not support response_format, so JSON output is not enforced.

Claude Opus 4.1 accepts images, text, and files such as PDFs as input and returns text.

Claude Opus 4.1 is served by 2 providers on OpenRouter: Amazon Bedrock and Google Vertex. Requests are routed to the best available provider, with automatic failover to the others, and you can pin or exclude providers with provider routing.

Claude Opus 4.1 was released on August 5, 2025. Its knowledge cutoff is January 31, 2025.