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Claude Opus 5

AnthropicLarge Language ModelProprietary

Anthropic's flagship Opus-tier model, released July 2026. Within 0.5% of Claude Fable 5 on agentic coding benchmarks at half the cost, with adaptive thinking on by default and state-of-the-art results in debugging, computer use, and long self-verifying tasks.

Abilities

Text GenerationCode GenerationReasoningMathVisionFunction CallingStructured OutputLong ContextMultilingual

Use Cases

Coding AssistantResearchEnterpriseData AnalysisAutomation

Available in Tools

Claude Codehttps://docs.anthropic.com/en/docs/claude-code
Claude Desktophttps://claude.ai/download
Claude.aihttps://claude.ai
Cursorhttps://cursor.com

Availability

APIhttps://console.anthropic.com
Claude Webhttps://claude.ai
Claude Mobile
Amazon Bedrock
Google Vertex AI
Microsoft Foundry

How to Use

Use the Anthropic Messages API with model ID `claude-opus-5`. Adaptive thinking is on by default; control depth with the `effort` parameter (low through max). A fast mode research preview is available at $10/$50 per MTok.

Pros

  • Near-Fable-5 quality at half the price — within 0.5% on agentic coding benchmarks at $5/$25 per MTok
  • 1M token context window with 128K max output (300K via Batch API beta)
  • Adaptive thinking on by default — unlike Opus 4.8, no configuration needed for deep reasoning
  • State-of-the-art computer use and debugging — top scores on OSWorld 2.0 and root-cause analysis tasks
  • Optional fast mode (research preview) with up to 2.5x higher output speed at $10/$50 per MTok
  • Available on AWS Bedrock, Google Vertex AI, and Microsoft Foundry for enterprise compliance

Cons

  • Closed source — no self-hosting or model customization
  • Not eligible for Priority Tier capacity reservations
  • Slower than Sonnet 5 and Haiku 4.5 for latency-sensitive interactive use
  • At $5/1M input still costly for very high-volume pipelines

What to Use It For

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Perfect For

Agentic coding and autonomous debugging

Near-Fable-5 coding quality at half the cost — the best price-to-capability ratio in the frontier tier

Computer use and UI automation

State-of-the-art OSWorld 2.0 results for automating browser and desktop workflows

Long self-verifying autonomous tasks

Designed to pace itself, verify its own work, and finish long-horizon tasks gracefully

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Good For

Enterprise knowledge work and analysis

Strong reasoning and document analysis at a practical frontier-tier price

Processing massive documents and codebases

1M context window holds entire repos or book-length documents in context

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Not Recommended

High-volume cost-sensitive batch tasks

At $5/1M input, Sonnet 5 ($2/1M) or Haiku 4.5 ($1/1M) are much cheaper for bulk work

Try instead: Claude Sonnet 5, Claude Haiku 4.5

Latency-critical real-time chat

Deep adaptive reasoning adds perceptible delay — Sonnet 5 is faster for interactive applications

Try instead: Claude Sonnet 5

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Do Not Use For

Image generation

Text and vision LLM only — no image generation capabilities

Try instead: GPT Image 2.5, FLUX.2 Pro

Self-hosting or offline use

Closed source cloud-only model — completely dependent on the Anthropic API

Try instead: Llama 4 Maverick, Qwen 3

Technical Details

Pricing$5 / 1M input tokens, $25 / 1M output tokens (fast mode: $10 / $50)
ParametersUndisclosed
detail.contextWindow1M tokens (128K max output)

Links

language Website description API Documentation