GPT text model pricing has been updated. All GPT text models are now billed at 10% of OpenAI's official API prices, including the latest official price reductions for GPT-5.6 Terra and Luna.View latest pricing
Claude

Claude Sonnet 5

Official

anthropic/claude-sonnet-5

Anthropic's most agentic Sonnet yet. Plans, uses tools, and runs autonomously at a level that recently required larger, pricier models — approaching Opus 4.8 on reasoning, coding, and tool use, at a fraction of the cost. 1M-token context window with native prompt caching. The new default for most agentic and production workloads.

1000K contextVisionReasoningTool callingCodingPrompt cache

Pricing

Source: anthropic_x0.18 · Verified 2026-07-23

InputOfficial $3 / M tokens
$0.54/ M tokensSave 82%
OutputOfficial $15 / M tokens
$2.7/ M tokensSave 82%

Cache read $0.054/M · Cache write $0.675/M

Estimate cost

Estimated cost$0.0081

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-sonnet-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-sonnet-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 Sonnet 4.6

Anthropic Claude Sonnet 4.6 — best price-to-quality balance.

$0.54/M↓ · $2.7/M↑

Frequently asked questions

›What is Claude Sonnet 5?

Anthropic's most agentic Sonnet — Opus-class capability at lower cost.

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

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

›How much does the Claude Sonnet 5 API cost?

Through RouteMux, Claude Sonnet 5 costs $0.54 for input and $2.7 for output (USD per 1M tokens), below the official list price.

›How do I call Claude Sonnet 5 via API?

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

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

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