Claude Opus 4.5

anthropic/claude-4.5-opus-20251124

Claude Opus 4.5, from Anthropic, accepts file, image, and text inputs and produces text output. It supports tool usage and reasoning, provides a context length of 200 000 tokens, and is priced at $5 per million input tokens and $25 per million output tokens. The model was released on 2025‑11‑24 and its weights are not open.

  • tool use
  • structured outputs
  • reasoning

At a glance

provideranthropic
releasedNov 24, 2025
context200K
input / M$5

Specifications

What the API gives you

Context window
200K tokens
Max output
64K tokens
Input price
$5 / 1M tokens
Output price
$25 / 1M tokens
Cache read
$0.50 / 1M tokens
Modalities
file, image, text → text
Knowledge cutoff
—
Released
Nov 24, 2025

Recommendation coverage

Where this model appears

  1. #1Best LLM for Agentic Coding
  2. #2Best LLM for Debugging & Code Review
  3. #5Best LLM for AI Agents

Measured evidence

Public benchmark record

LMArena Text
1450 Elo2026-07-16
LMArena WebDev
1466 Elo2026-07-16
LMArena WebDev
1466 Elo2026-07-20
SWE-bench Verified†
79.2%2025-12-15
SWE-bench Verified†
79.2%2025-12-05

LMArena data licensed CC-BY-4.0. Aider (Apache-2.0) and SWE-bench (MIT) are open. † Self-reported scaffold plus model result. Treat it as a claim, not an independent measurement.

Catalog data via OpenRouter and models.dev. Last checked within the past 6 hours.