Last refreshed 2026-11-09. Next refresh: weekly.
Why use Claude Fable 5.2 on GCP Vertex AI?
GCP Vertex AI offers Claude Fable 5.2. Vertex AI is Google Cloud's managed AI platform, offering access to Gemini models and hundreds of partner models alongside tools for fine-tuning, grounding, vector search, and end-to-end MLOps pipelines.
Compare Claude Fable 5.2 across 5 providers to find the best fit for your use caseSetup recipe
Python + curlpip install google-cloud-aiplatformexport GOOGLE_CLOUD_PROJECT=...import os
import vertexai
from vertexai.generative_models import GenerativeModel
vertexai.init(project=os.environ["GOOGLE_CLOUD_PROJECT"], location="us-central1")claude-fable-5-2Request example
import os
import vertexai
from vertexai.generative_models import GenerativeModel
# Reads GOOGLE_CLOUD_PROJECT from env; authenticates via Application Default Credentials
vertexai.init(project=os.environ["GOOGLE_CLOUD_PROJECT"], location="us-central1")
model = GenerativeModel("claude-fable-5-2")
response = model.generate_content("Hello")
print(response.text)Gotchas
- For Google-published models use the model name directly, e.g. "gemini-2.0-flash-001". For third-party publishers (Anthropic, Meta, etc.) use the full publisher path, e.g. "publishers/anthropic/models/claude-3-5-sonnet-v2@20241022".
- The examples expect GOOGLE_CLOUD_PROJECT; rename it only if your application config maps the new variable.
Compare Claude Fable 5.2 Across Providers
| Provider | Input (per 1M) | Output (per 1M) |
|---|---|---|
| Anthropic | $8.00 | $40.00 |
| AWS Bedrock | — | — |
| GCP Vertex AI | — | — |
| OpenRouter | $8.00 | $40.00 |
| Vercel AI Gateway | $8.00 | $40.00 |
Capabilities
About Claude Fable 5.2
Claude Fable 5.2 is Anthropic's generally available Mythos-class model for demanding reasoning and long-horizon agentic work, released November 9, 2026. It is the same underlying model as Claude Mythos 5.2 with cybersecurity and biology safeguards; requests those safeguards catch can fall back to other Claude models. Claude API id claude-fable-5-2. 1M-token context, 128K max output, adaptive thinking always on (default effort high), text and image input to text output. Knowledge cutoff June 2026. Anthropic documents model IDs for the Claude API, Amazon Bedrock, Claude Models on Google Cloud (Google-managed and Anthropic-managed), Microsoft Foundry and Claude Platform on AWS.