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Favicon for anthropic

Anthropic: Claude Opus 4.8

anthropic/claude-opus-4.8

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Claude Opus 4.8 is Anthropic's most capable generally available model in the Opus family. It supports text, image, and file inputs with text output, with reasoning support and a 1M-token context window. It is suited for highly autonomous agents, long-horizon agentic work, knowledge work, and memory-driven tasks where coherence over extended sessions matters.

It is particularly strong on multi-step reasoning, complex coding, and end-to-end project orchestration - large codebases, multi-stage debugging, and long-running asynchronous agent pipelines. Beyond coding, it handles knowledge work such as drafting documents, building presentations, and analyzing data, maintaining quality across very long outputs.

Modalities
In / Out Price
$5 / $25per 1M
Context
1.0M
Released
May 27, 2026
Compare
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), or Floor (cheapest).

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 and this model’s own outputs on shared benchmark prompts. Higher percentages are better — and each rank shows where this model lands among the models evaluated on that source.

Benchmark score summary for Anthropic: Claude Opus 4.8 (Artificial Analysis, Design Arena and Vals AI)
SourceBenchmarkScore
Artificial AnalysisClaude Opus 4.8 (Max) Intelligence Index41.8
Artificial AnalysisClaude Opus 4.8 (Max) Coding Index74.3
Artificial AnalysisClaude Opus 4.8 (Max) Agentic Index41.9
Artificial AnalysisClaude Opus 4.8 (Max) GPQA Diamond92.0%
Artificial AnalysisClaude Opus 4.8 (Max) HLE48.7%
Artificial AnalysisClaude Opus 4.8 (Max) IFBench62.2%
Artificial AnalysisClaude Opus 4.8 (Max) τ²-Bench Telecom94.4%
Artificial AnalysisClaude Opus 4.8 (Max) AA-LCR77.7%
Artificial AnalysisClaude Opus 4.8 (Max) τ-Bench Banking34.2%
Artificial AnalysisClaude Opus 4.8 (Max) GDPval-AA47.7%
Artificial AnalysisClaude Opus 4.8 (Max) CritPt20.9%
Artificial AnalysisClaude Opus 4.8 (Max) SciCode54.4%
Artificial AnalysisClaude Opus 4.8 (Max) Terminal-Bench Hard58.3%
Artificial AnalysisClaude Opus 4.8 (Max) Terminal-Bench 4.021.7%
Artificial AnalysisClaude Opus 4.8 (Max) Terminal-Bench 2.184.6%
Artificial AnalysisClaude Opus 4.8 (Max) AA-Omniscience Accuracy48.8%
Artificial AnalysisClaude Opus 4.8 (Max) AA-Omniscience Non-Hallucination Rate60.7%
Design ArenaClaude Opus 4.8 Agents Arena Agenticgamedev Elo1238
Design ArenaClaude Opus 4.8 Agents Arena Agentichtmlslides Elo1227
Design ArenaClaude Opus 4.8 Agents Arena Agenticslides Elo1294
Design ArenaClaude Opus 4.8 Agents Arena Agenticslides(Html) Elo1230
Design ArenaClaude Opus 4.8 Agents Arena Agenticslides(Python-Pptx) Elo1310
Design ArenaClaude Opus 4.8 Agents Arena Androidnative Elo1247
Design ArenaClaude Opus 4.8 Agents Arena Full Stack Elo1249
Design ArenaClaude Opus 4.8 Agents Arena Godotgamedev Elo1231
Design ArenaClaude Opus 4.8 Agents Arena Htmlslides Elo1220
Design ArenaClaude Opus 4.8 Agents Arena Mobile Apps Elo1220
Design ArenaClaude Opus 4.8 Agents Arena Pptxslides Elo1306
Design ArenaClaude Opus 4.8 Agents Arena Python-Pptxslides Elo1298
Design ArenaClaude Opus 4.8 Agents Arena Python-Pptxslides Elo1227
Design ArenaClaude Opus 4.8 Agents Arena Webapps Elo1231
Design ArenaClaude Opus 4.8 Models Arena 3D Elo1224
Design ArenaClaude Opus 4.8 Models Arena Asciiart Elo1278
Design ArenaClaude Opus 4.8 Models Arena Code Categories Elo1255
Design ArenaClaude Opus 4.8 Models Arena Data Visualization Elo1240
Design ArenaClaude Opus 4.8 Models Arena Game Development Elo1265
Design ArenaClaude Opus 4.8 Models Arena SVG Elo1193
Design ArenaClaude Opus 4.8 Models Arena UI Component Elo1258
Design ArenaClaude Opus 4.8 Models Arena Website Elo1259
Vals AIClaude Opus 4.8 Code Migration47.3%
Vals AIClaude Opus 4.8 CorpFin v266.7%
Vals AIClaude Opus 4.8 EMB69.4%
Vals AIClaude Opus 4.8 Finance Agent (v2)53.9%
Vals AIClaude Opus 4.8 GPQA Diamond92.4%
Vals AIClaude Opus 4.8 Harvey's Legal Agent Benchmark9.6%
Vals AIClaude Opus 4.8 LiveCodeBench87.8%
Vals AIClaude Opus 4.8 LegalBench83.6%
Vals AIClaude Opus 4.8 Legal Research Bench43.8%
Vals AIClaude Opus 4.8 MedCode53.2%
Vals AIClaude Opus 4.8 MedScribe85.8%
Vals AIClaude Opus 4.8 MMLU Pro89.6%
Vals AIClaude Opus 4.8 MMMU Pro86.6%
Vals AIClaude Opus 4.8 MortgageTax69.9%
Vals AIClaude Opus 4.8 ProgramBench1.0%
Vals AIClaude Opus 4.8 ProofBench v169.0%
Vals AIClaude Opus 4.8 Vals RSI Index24.0%
Vals AIClaude Opus 4.8 SAGE54.8%
Vals AIClaude Opus 4.8 SkillsBench59.2%
Vals AIClaude Opus 4.8 SWE-bench88.6%
Vals AIClaude Opus 4.8 Tax Agent Bench30.0%
Vals AIClaude Opus 4.8 TaxEval v275.6%
Vals AIClaude Opus 4.8 Terminal-Bench 4.023.2%
Vals AIClaude Opus 4.8 Vals Index55.1%
Vals AIClaude Opus 4.8 Vals Multimodal Index70.9%
Vals AIClaude Opus 4.8 Vibe Code Bench v1.182.7%

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.

API

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.

Anthropic: Claude Opus versions

Available through EU in-region routing

Anthropic: Claude Opus 4.8 is available through EU in-region routing. Requests sent to eu.openrouter.ai are decrypted in the EU and routed only to shared provider endpoints in Europe (the EU/EEA, the UK, and Switzerland).

Providers in Europe
Amazon Bedrock, Google Vertex
Prices in Europe
  • Amazon Bedrock: $5.50/M tokens input, $27.50/M tokens output
  • Google Vertex: $5.50/M tokens input, $27.50/M tokens output
Base URL
https://eu.openrouter.ai/api/v1
Plan
Requires Business or Enterprise. Self-serve on Business: no contract, no monthly minimum. OpenRouter Business for EU in-region routing

Fails closed: if no shared provider endpoint in Europe is available, the request errors instead of leaving the region. Requests served by your own BYOK key go to your deployment’s region, which you control. In-region routing docs

Explore more models

AI Models with Vision: Multimodal LLMs for Image UnderstandingCollectionAI Model RankingsRanking
AutoExacto benchmarks
GPQA DiamondTAU-BenchAzure89.9%79.7%Google Vertex90.1%79.3%Anthropic89.9%78.9%Google Vertex89.9%78.7%Google Vertex90.6%77.9%Claude Platform on AWS90.0%78.1%Amazon Bedrock90.2%77.6%Azure90.5%76.9%Amazon Bedrock90.2%76.4%Amazon Bedrock89.9%76.5%
+1 more providers

Frequently asked questions

Claude Opus 4.8 is Anthropic's most capable generally available model in the Opus family. It supports text, image, and file inputs with text output, with reasoning support and a 1M-token context window. It is suited for highly autonomous agents, long-horizon agentic work, knowledge work, and memory-driven tasks where coherence over extended sessions matters.

Claude Opus 4.8 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, Cache Write (1h) at $10.00/M tokens, and Web Search at $10.00/1K calls.

Claude Opus 4.8 has a 1,000,000 token context window. It supports up to 128,000 completion tokens.

Yes. Claude Opus 4.8 accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

Claude Opus 4.8 accepts text, images, and files such as PDFs as input and returns text.

Claude Opus 4.8 is served by 5 providers on OpenRouter: Claude Platform on AWS, Azure, Amazon Bedrock, Google Vertex, and Anthropic. 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 4.8 was released on May 27, 2026.