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Claude

Claude Opus 5

Official

anthropic/claude-opus-5

Anthropic's current Opus. A step change over Opus 4.8 on deep reasoning, agentic coding, and long-horizon autonomous work, at the same price. Completes multi-file features and larger refactors instead of leaving stubs, and finds real bugs with high precision. 1M-token context window with native prompt caching. Pick it when the task is hard and you want it finished in one pass.

1000K contextVisionReasoningTool callingCodingPrompt cache

Pricing

Source: anthropic_x0.18 · Verified 2026-07-26

InputOfficial $5 / M tokens
$0.9/ M tokensSave 82%
OutputOfficial $25 / M tokens
$4.5/ M tokensSave 82%

Cache read $0.09/M · Cache write $1.125/M

Estimate cost

Estimated cost$0.0135

Protocols

  • OpenAI Chat CompletionsStatus: Not supported—
  • OpenAI ResponsesStatus: Not supported—
  • Anthropic MessagesStatus: Available: Streaminghttps://api.routemux.com/anthropic
  • Google Vertex AIStatus: Not supported—
  • OpenAI ImagesStatus: Not supported—
  • OpenAI SoraStatus: Not supported—

Call IDs

Use either ID to call this model via the API.

RouteMux nameanthropic/claude-opus-5

Try it

Replace the ROUTEMUX_KEY placeholder with your API key. Create one →

from anthropic import Anthropic

client = Anthropic(
    base_url="https://api.routemux.com/anthropic",
    api_key="<ROUTEMUX_KEY>",
)

message = client.messages.create(
    model="anthropic/claude-opus-5",
    max_tokens=1024,
    messages=[{"role": "user", "content": "What is the meaning of life?"}],
)
print(message.content[0].text)
base_url: https://api.routemux.com/anthropic

Other variants in this family

ClaudeClaude Opus 4.7

Anthropic Claude Opus 4.7 — top-tier reasoning, coding, agentic work.

$0.9/M↓ · $4.5/M↑

ClaudeClaude Opus 4.6

Anthropic Claude Opus 4.6 — previous-gen Opus, same price as 4.7/4.8.

$0.9/M↓ · $4.5/M↑

ClaudeClaude Opus 4.8

Anthropic Claude Opus 4.8 — current flagship, top reasoning & coding.

$0.9/M↓ · $4.5/M↑

Frequently asked questions

›What is Claude Opus 5?

Anthropic Claude Opus 5 — current-generation Opus for agentic coding and long-horizon work.

›How large is the context window of Claude Opus 5?

Claude Opus 5 supports a context window of up to 1M tokens, with up to 8K output tokens per request.

›How much does the Claude Opus 5 API cost?

Through RouteMux, Claude Opus 5 costs $0.9 for input and $4.5 for output (USD per 1M tokens), below the official list price.

›How do I call Claude Opus 5 via API?

Claude Opus 5 is OpenAI-compatible: point your base URL at RouteMux and set the model field to anthropic/claude-opus-5 — no code changes needed.

›Which input and output modalities does Claude Opus 5 support?

Claude Opus 5 accepts text, image as input and produces text as output.