Latest Claude model coverage
Use Claude Opus 5, Sonnet 5, Opus 4.8, Sonnet 4.6, Sonnet 4.5, and Haiku 4.5 from the same Flatkey account as they are available in the catalog.
Call the latest Claude models through one OpenAI-compatible API key. Use Claude Opus 5, Sonnet 5, Opus 4.8, Sonnet 4.6, and Haiku 4.5 without a separate Anthropic setup.
GPT · Gemini · Claude · DeepSeek · Kimi · Seedance — one key, one invoice · no credit card to start
Claude API access
| Modelo | Flatkey | Reference |
|---|---|---|
| Claude Sonnet 5 output / 1M tokens | $9.00 | $10.00 |
| Claude Opus 5 and Opus 4.8 | One key | Separate setup |
| Claude Sonnet 4.6 and Haiku 4.5 | One key | Separate setup |
* Representative coverage — see live pricing for current Claude model rates and availability.
Use Claude Opus 5, Sonnet 5, Opus 4.8, Sonnet 4.6, Sonnet 4.5, and Haiku 4.5 from the same Flatkey account as they are available in the catalog.
Keep the OpenAI SDK already in your application. Change base_url, set a Flatkey API key, and choose the Claude model id you need.
Claude is a strong fit for coding agents, support automation, analysis workflows, and long-context reasoning where output quality matters.
Compare Claude with GPT, Gemini, DeepSeek, Qwen, Kimi, and GLM without creating separate provider accounts or changing your API integration.
Call the latest Claude models through one OpenAI-compatible API key. Use Claude Opus 5, Sonnet 5, Opus 4.8, Sonnet 4.6, and Haiku 4.5 without a separate Anthropic setup.
Get your Claude API keyGPT · Gemini · Claude · DeepSeek · Kimi · Seedance — one key, one invoice · no credit card to start
Current catalog coverage includes Claude Opus 5, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, Claude Opus 4.5, Claude Sonnet 4.6, Claude Sonnet 4.5, and Claude Haiku 4.5 when available.
Yes. Point the SDK at the Flatkey /v1 base URL, use a Flatkey API key, and choose the Claude model id you need, such as claude-sonnet-5.
No. flatkey.ai is OpenAI-compatible: keep your existing OpenAI SDK and switch base_url plus api_key. Model ids stay the same.
One plan covers every model. Usage analytics and a single invoice keep spend bounded before you scale.