Setup note · 3 steps
SayGM in Anthropic SDK
Some gateways convert every model to an OpenAI-shaped API. SayGM passes the Anthropic API through unchanged.
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Steps
Step 1: Install the anthropic package.
Step 2: Construct the client with base_url set to the SayGM Anthropic endpoint and api_key set to your SayGM key.
Step 3: Call messages.create with claude-opus-5, claude-sonnet-5 or claude-haiku-4.5.
import osfrom anthropic import Anthropic client = Anthropic( base_url=os.environ["SAYGM_ANTHROPIC_BASE_URL"], api_key=os.environ["SAYGM_API_KEY"],) message = client.messages.create( model="claude-sonnet-5", max_tokens=1024, messages=[{"role": "user", "content": "Write a release note for v2.1."}],)§ 02
Why route Anthropic SDK through a gateway
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Prompt caching works because SayGM pins a conversation to one provider.
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Provider-specific features are not stripped by a translation layer.
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Claude models are about 15 percent below OpenRouter in the October snapshot.
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Models worth trying in Anthropic SDK
Snapshot SayGM prices per million tokens, input then output.
- Claude Fable 5.1The hardest reasoning and agent tasks, where cost matters least$8.89 / $44.45
- Claude Opus 5.5Agentic coding, long multi-step tasks, hard reasoning$3.56 / $17.78
- Claude Sonnet 5.5Daily coding in Cursor, Cline and Claude Code$1.78 / $8.89
- Claude Opus 5Agentic coding, long multi-step tasks, hard reasoning$4.45 / $22.23
- Claude Sonnet 5Daily coding in Cursor, Cline and Claude Code$1.78 / $8.89
- Claude Haiku 4.5Classification, extraction, high-volume pipelines$0.89 / $4.45
Other notes: Cursor · Cline · Claude Code · Vercel AI SDK · OpenAI SDK
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Anthropic SDK questions
Does Anthropic SDK work with SayGM?
Yes. Some gateways convert every model to an OpenAI-shaped API. SayGM passes the Anthropic API through unchanged.
Which models can I use in Anthropic SDK through SayGM?
Any model in the SayGM catalogue, including Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, Claude Opus 5 and confidential open-weight models.
Where do I find the SayGM base URL?
The endpoints for the OpenAI, Anthropic and Gemini compatible APIs are listed in the SayGM developer docs, linked from the SayGM website after sign-up.