Streaming
Return partial output as it is generated for responsive product experiences.
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Anthropic/ LLMAvailable
Anthropic/ LLMAvailableClaude Sonnet 5.5 API
claude-sonnet-5-5Claude Sonnet 5.5 for everyday coding, structured writing, and long-document work. Text and image input, tools, and streaming are supported, with 1M input tokens and 128K output tokens. Studio and API token rates are 80% of the official reference.
- Streaming
- Vision
Playground
Configure a request, inspect the exact JSON, then run it with your account.
API key
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Multimodal inputsUp to 10 images, 10MB each
Response
The API response will appear here.
API PRICING
API pricing
Compare the complete API billing table for this route. Token models separate input, output, cache-read, cache-write, and long-context rates; media models vary by configuration.
Per 1M tokens
Input$1.6
Output$8
Cache read$0.16
Cache write (5m)$2
Cache write (1h)$3.2
USD / 1M tokens
The accepted task response is the source of truth for its final pricing snapshot.
CAPABILITIES
What this route supports
Use one stable PixMind model ID while keeping provider-specific setup out of your application.
Vision
Analyze supplied images together with written instructions.
TECHNICAL SPECS
Supported parameters
Inputs, supported configurations, and request parameters for the Claude Sonnet 5.5 API.
- Context window
- 1,000,000 tokens
- Maximum output
- 128,000 tokens
- Token billing
- Input · Output · Cache read · Cache write (5m / 1h)
- Thinking
- Adaptive · effort low / medium / high / xhigh / max
- Endpoint
- POST /v1/chat/completions
MODEL WORKFLOWS
What to build with Claude Sonnet 5.5
Choose a task that matches the live route capabilities, then adapt one of these prompt starters.
Best-fit tasks
- Build drafting, rewriting, extraction, classification, and conversational workflows.
- Return partial output as it is generated for responsive product experiences.
- Analyze supplied images together with written instructions.
Prompt starters
Replace the bracketsStarter
Inspect the supplied image for [task]. Separate direct observations from inferences, extract [required fields], and return the result as [format].
Starter
Answer [user task] in a clear structure. Put the direct result first, keep each section self-contained, and avoid delaying essential information until the end.
MODEL SELECTION
Choose Claude Sonnet 5.5 when the job fits
Compare nearby live routes by task, supported capability, and current entry price before you lock a model ID into production.
| Model | Best for | Key capabilities | Entry price | Availability | Action |
|---|---|---|---|---|---|
Claude Sonnet 5.5 Anthropic · current page | Build drafting, rewriting, extraction, classification, and conversational workflows. | Text · Streaming · tool-calling | $1.6 / 1M tokens | Available | Selected |
Claude Fable 5 Anthropic | Build drafting, rewriting, extraction, classification, and conversational workflows. | Text · Vision · Reasoning | $8.065 / 1M tokens | Available | View route |
Claude Haiku 5.5 Anthropic | Build drafting, rewriting, extraction, classification, and conversational workflows. | Text · Vision · Reasoning | $0.08 / 1M tokens | Available | View route |
Claude Opus 4.8 Anthropic | Build drafting, rewriting, extraction, classification, and conversational workflows. | Text · Vision · Reasoning | $4.032 / 1M tokens | Available | View route |
Capabilities and starting prices are a current PixMind route snapshot. The accepted request contains the final configuration and billing quote.
GET STARTED
From playground to production
Create a scoped key
Create an API key with the permissions required by this model.
Send the request
Use the model ID and endpoint shown above from your backend service.
Track the task
Read language-model output from the response. For image and video requests, use the returned task ID to retrieve the result.
FAQ
Claude Sonnet 5.5 API questions
What model ID should I use for the Claude Sonnet 5.5 API?+
Use claude-sonnet-5-5 in the model field. This is the stable PixMind route identifier shown in the playground request JSON.
Which endpoint does the Claude Sonnet 5.5 API use?+
Send POST requests to /v1/chat/completions. Keep your API key on your server and pass it as a Bearer token.
Is the playground using a real API request?+
Yes. When you click Run model, PixMind forwards the displayed payload with the API key you entered. A successful request may create a paid task.
Does PixMind save the API key entered here?+
No. The playground keeps the key only in component memory and sends it for the current request; it is not written to browser storage.
Is API pricing the same as PixMind Studio pricing?+
No. API usage resolves through the apiPlatform pricing role and a separate pay-as-you-go ledger. Studio pricing includes the creation interface and product workflow services.
Why can the final price differ from the starting price?+
The entry price reflects the configuration displayed on this page. Resolution, duration, quality, audio, references, and output count can affect the final task price.
How do I receive a finished image or video?+
Generation routes can return an asynchronous task. Save its ID and query the task endpoint until the status is succeeded, failed, or cancelled.
Can I use the same integration for other PixMind models?+
Yes. Models in the same workload family share the generation contract, so switching usually means changing the model ID and supported parameters.
RELATED MODELS
Compare other API routes
Anthropic
Claude Fable 5
Anthropic's Mythos-class route for autonomous knowledge work, long-form reasoning, and coding. Choose Fable 5 when an agent must retain context across extended tasks, inspect visual inputs, and coordinate tools before producing a concise result.
View APIAnthropic
Claude Haiku 5.5
Claude Haiku 5.5 for batch extraction, classification, summaries, and repeatable chat tasks. Input costs $0.08 per 1M tokens up to 100K input tokens; above 100K, the whole request uses the higher tier, with input at $0.40. Studio and API prices match.
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Claude Opus 4.8
A high-capability Opus route for complex reasoning, coding, vision, and tool-driven execution. Use it for long tasks that benefit from careful planning, repository context, and consistent decisions across many steps.
View APISTART WITH THE CONTROL PLANE
Turn your first Claude Sonnet 5.5 prompt into a real API request
Test the exact payload in the playground, then create a scoped key and move the same model ID into your application.