Claude Opus
Anthropic’s high-stakes widely released Claude for hard agentic work; Fable 5.1 sits above it for peak capability.
Anthropic’s Claude Opus 5 tier for complex agentic coding, enterprise work, long-context analysis, and careful instruction following. Claude Fable 5.1 sits above Opus for peak widely released capability.
Why Claude Opus matters
Opus is what teams pick when instruction following, long-context synthesis, and careful agentic coding matter more than raw price. Fable 5.1 is the public capability ceiling; Opus remains the usual escalation off Sonnet for high-stakes enterprise and verification-heavy loops.
Vision · Tool calling · Thinking · MCP · Coding
Last reviewed: 2 September 2026
When to choose Claude Opus
Decision guidance for architects—not a feature list.
Best for
- Long-document analysis
- Agentic coding with verification
- High-stakes writing and policy
- Research assistants with tools
Avoid if
- You need the cheapest Claude tier for high-volume chat
- Open weights or audio-first multimodal are requirements
Strengths
Qualitative snapshot for architects—not a public ranking.
- Instruction following★★★★★
- Agentic coding★★★★★
- Long context★★★★★
- Cost efficiency★★☆☆☆
- Open weights★☆☆☆☆
Ecosystem
Built by
- Anthropic
Opus is Anthropic’s top widely released Claude capability tier.
Competes with
- GPT-5
Primary closed-model rival for coding agents and enterprise assistants.
Works with
Recommended for
- AI Agents
Preferred when agent reliability and verification loops matter most.
Often paired with
- Claude Sonnet
Teams often route hard tasks to Opus and everyday production traffic to Sonnet.
How Claude Opus evolved
Key moments in chronological order.
- API
Computer use is generally available as computer_toolset_20260801; browser_toolset_20260801 adds viewport/accessibility-tree control. Supported on Opus 5 (and peer Claude tiers).
- Model
Opus 5 ships as Anthropic’s everyday high-capability tier for agentic coding and 1M context at the same API rates as Opus 4.8.
- Product
1M-token context class
Document-heavy analysis and long agent threads become practical.
- Platform
MCP support expands
Model Context Protocol tooling broadens Claude’s agent integration surface.
- Product
Computer-use style workflows
UI and tool-driven agent patterns push Claude into operational automation.
- Model
Claude 3 Opus launches
Establishes Opus as Anthropic’s peak-capability brand in the Claude family.
Overview
Capabilities
- Vision: Yes
- Audio: No
- Tool calling: Yes
- Thinking: Yes
- MCP: Yes
- Coding: Yes
- Structured output: Yes
Technical specifications
- Provider
- Anthropic
- License
- Proprietary
- Context window
- 1M
- Parameters
- Undisclosed
- Architecture
- Transformer (proprietary)
- Release
- 2026-07
- Modalities
- Text, Image
- Vision
- Yes
- Audio
- No
- Tool calling
- Yes
- Thinking
- Yes
- MCP
- Yes
- Open weights
- No
- API
- Yes
- Pricing (input)
- ~$5 per 1M tokens (claude-opus-5)
- Pricing (output)
- ~$25 per 1M tokens
Supported modalities
Text · Image
Context window
1M (1,000,000 tokens)
Pricing
Fast mode is higher; verify Anthropic pricing.
Availability
Claude.ai and Anthropic API (claude-opus-5); also via major cloud partners. Computer use GA (computer_toolset_20260801) and browser use (browser_toolset_20260801) as of 2026-08-19. SynthID-Text watermarking applied globally from Aug 14 2026 (EU AI Act); C2PA on images/SVGs; detection API forthcoming.
Use cases
- Long-document analysis and synthesis
- High-stakes writing and policy drafting
- Agentic coding and computer/browser-use workflows
- Research assistants with tool use
Strengths
- Strong agentic coding and verification loops
- GA computer use + browser toolsets for UI automation
- Strong safety / constitutional AI posture
- 1M-token context for document-heavy work
Limitations
- Closed weights
- Below Claude Fable 5.1 on peak capability; higher cost than Sonnet/Haiku
- Audio modality limited vs some peers
Related guides
Related benchmarks
Related research
- Anthropic research & model cards
Evaluation
Related GitHub
Related tools
Related rankings
Related comparisons
Companies
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