Claude Sonnet 5

Anthropic's new Sonnet model for extended-context coding, agents, and enterprise production workflows.

1M Context128k OutputAgentic Coding

Context Window

1M tokens

claude-sonnet-5

Max Output

1M tokens

Input

$1.8$2

10% off

1M tokens

Output

$9$10

10% off

1M tokens

Model Codeclaude-sonnet-5

Playground

Model Code

claude-sonnet-5

Reference inputs

Reference Images0/5

Click or drag

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Output

No output yet

Pricing

Plan	Context Window	Max Output	Input	Output	Cache Write	Cache Read
claude-sonnet-5	1M tokens	-	$1.8$210% off 1M tokens	$9$1010% off 1M tokens	$2.25$2.5010% off 1M tokens	$0.18$0.210% off 1M tokens

1h Cache Write · $3.6 · 1M tokens

Cache read or cached input pricing applies to reused prompt tokens.

README

Claude Sonnet 5 is Anthropic's newest Sonnet model, built for long-context reasoning, agentic coding, tool-heavy workflows, and production workloads that need stronger sustained performance than prior Sonnet releases.

Claude Sonnet 5 extends the Sonnet line with a 1M-token context window and 128k-token maximum output, making it better suited for large repositories, multi-document analysis, and long-running agent sessions.
The model is positioned for coding, tool use, enterprise automation, and other workflows where teams need reliable reasoning over substantial context without moving every request to an Opus-tier model.
ReachAPI exposes the model through the `claude-sonnet-5` model code so teams can route new Sonnet workloads through the same API surface used by existing Claude models.

API

Use the API docs for request format, parameters, and integration details.

Anthropic's new Sonnet model for extended-context coding, agents, and enterprise production workflows.

Model Code

claude-sonnet-5

View API Docs

API

Endpoint

POST /v1/messages

Authentication

Authorization: Bearer YOUR_REACH_API_KEY
anthropic-version: 2023-06-01
Content-Type: application/json

Example

curl -X POST "https://direct.reachapi.ai/v1/messages" \
  -H "Authorization: Bearer YOUR_REACH_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "YOUR_MODEL_ID",
    "messages": [
      {
        "role": "user",
        "content": "Introduce ReachAPI in one sentence."
      }
    ],
    "max_tokens": 512,
    "temperature": 0.2
  }'

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