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Model Guide

claude-opus-4-5

claude-opus-4-5 is a production text model for chat, coding, long-context reasoning, and tool-enabled workflows through Flatkey-compatible API access.

Vendor
Anthropic
Modalities
Text
Price
$5 in / $25 out
Updated
2026-08-12
Open in PlaygroundDocs
Model ID
claude-opus-4-5

Model Overview

Quick Answer

  • • Best for chat, code generation, agent workflows, and production assistants.
  • • Use Flatkey when you want OpenAI-compatible routing, unified billing, and reusable API keys.
  • • Start with the default parameters, then tune max tokens and temperature for your workload.

claude-opus-4-5 Model Features

Core capabilities and practical engineering value

OpenAI-compatible migration path

Chat Completions-style payloads reduce switching friction from existing model stacks.

Structured and tool-based output

Use structured JSON, tools, and code-generation flows for agentic workflows.

Streaming interaction

Streaming supports chat UIs, terminal assistants, and progressive rendering.

Production routing

Keep usage, keys, quotas, and model routing in one Flatkey account.

Long-context work

Useful for document summarization, codebase analysis, and knowledge workflows.

Coding and technical generation

Useful for code explanation, tests, refactors, SDK wrappers, and technical drafts.

How to Use claude-opus-4-5 API

  1. Create an API key and set Authorization: Bearer <YOUR_API_KEY>.
  2. POST to /v1/chat/completions with at least model and messages.
  3. Tune max_tokens, temperature, and top_p based on task complexity.
  4. Enable streaming for chat UIs, terminal assistants, and agent workflows.
  5. Use logs and retries to refine prompts before broader rollout.

Common Errors

400 invalid_request_error

Missing required fields, malformed messages, or unsupported parameter values.

401 authentication_error

Missing Authorization header, malformed bearer token, or invalid API key.

429 rate_limit_error

Request rate, concurrency, or quota is above current account limits.

500 internal_error

Transient upstream instability, tool execution failure, or processing issue.

FAQ

Does this use the same model id in my SDK?

Yes. Keep your SDK and switch base_url plus api_key.

Can I control usage before scaling?

Yes. Plan limits, usage analytics, and one invoice keep spend bounded.

Ready to unify your AI model access?

Use one Flatkey account to test prompts, compare models, and move the saved request into the console.

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