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Anthropic model

Claude Opus 4.5

Claude Opus 4.5 in the public Anthropic catalog.

Provider
Anthropic
Availability
Available
Model ID
claude-opus-4-5-20251101
Snapshot
2026-10-07
Evaluation Verdict

Claude Opus 4.5 is Anthropic's flagship deep reasoning engine (76.5% SWE-bench, 88.2% AIME 2024), specialized in deep systems architecture, complex theorem proving, and critical security audits.

Claude Opus 4.5 Benchmarks & Agentic Accuracy

Verified primary research & developer preference metrics

Primary Sources Verified
SWE-bench Verified
76.5%
Extended ThinkingAnthropic Technical Preview ↗
LiveCodeBench
66.8%
ThinkingLiveCodeBench ↗
LMSYS Coding Elo
1425Elo
Coding ArenaLMSYS Arena ↗
AIME 2024 / 2025
88.2%
ThinkingAnthropic Technical Preview ↗
Pricing ($ / 1M tokens)
$15/ $75
$0.5 cached readStandard API Pricing

What This Means in Real Software Development

  • Exceptional multi-step logical deduction (88.2% on AIME 2024, 74.5% on GPQA Diamond).
  • Solves 76.5% of real-world GitHub issues on SWE-bench Verified with exhaustive edge-case test generation.
  • Uncompromising analytical depth, making it the supreme choice for cryptographic, protocol, and kernel refactoring.
  • Priced at $15.00/M input, it is designed for highest-leverage architectural review and planning.

Swarm Multi-Agent Topology

Tier 1: Senior Principal ArchitectRole: Primary / Planner

Best Paired With: Gemini 3.8 Flash for fast subagent execution

Supreme model for high-stakes system architecture, zero-day security auditing, and critical algorithm proofs.

Git Worktree Isolation Advantage:

Audits Swarm worktree diffs for subtle race conditions, deadlocks, and memory leaks before promotion.

What Developers & Practitioners Are Saying

Real-world field observations, production strengths, and developer consensus

Field Consensus

"A major generational leap in frontier architectural reasoning, combining deep reflection with massive context coherence for enterprise codebases."

Verified Real-World Strengths

  • Exceptional multi-repo architectural synthesis and dependency mapping
  • High reasoning depth on intricate distributed systems design and protocols
  • Ultra-stable tool calling syntax across hundreds of autonomous turns

Production Caveats & Gaps

  • Premium pricing tier requiring disciplined subagent delegation
  • Output speed optimized for depth rather than high-frequency typing
Benchmark Reality Check

What the benchmark tests: Evaluates multi-system architectural refactoring and rigorous proof generation in complex codebases.

Production caveat: Best leveraged as a top-level planner; delegating file search to it burns budget without latency benefits.

Primary Sources & Methodology Citations

Claude Opus 4.5 model overview

Claude Opus 4.5 is listed in the public Swarm catalog through Anthropic. This page summarizes the verified catalog fields used by Swarm without claiming real-time access for every provider account.

Provider
Anthropic
Family
Claude
Context window
200K tokens
Thinking support
off
Availability status
Available
Catalog ID
anthropic/claude-opus-4-5-20251101
  • File input
  • Image input
  • Text input
  • Text output
  • Reasoning
  • Structured output
  • JSON
  • Batch

Run Claude Opus 4.5 in Swarm

Verified CLI workflow & multi-agent architecture

Quickstart Guide →
bash — swarm run
$swarm ctl model set --provider anthropic --model anthropic/claude-opus-4-5-20251101

# Or switch interactively inside the terminal TUI:

>/models

Subagent Role Matrix

Assign Claude Opus 4.5 to specialized system roles in ~/.swarm/config.json:

  • Primary / Planner: Orchestrates full task DAGs and multi-stage pipelines.
  • Coder Subagent: Generates code and unit tests inside private Git worktrees.
  • Finder Subagent: Performs read-only code search, symbol discovery, and mapping.
System Agent Roles →Why Swarm Architecture →
← All Anthropic models

Public catalog snapshot. Catalog availability is not a real-time provider status or an access guarantee.