Last refreshed 2026-06-09. Next refresh: weekly.
Why use Claude Mythos 5 on GCP Vertex AI?
GCP Vertex AI offers Claude Mythos 5 with competitive pricing. 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 Mythos 5 across 3 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-mythos-5Request 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-mythos-5")
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 Mythos 5 Across Providers
| Provider | Input (per 1M) | Output (per 1M) |
|---|---|---|
| Anthropic | $10.00 | $50.00 |
| AWS Bedrock | — | — |
| GCP Vertex AI | — | — |
Capabilities
About Claude Mythos 5
Anthropic's access-gated frontier model, available exclusively through Project Glasswing to approved cybersecurity defenders and biomedical research organizations. Shares the same underlying architecture as Claude Fable 5 but operates with safety classifiers lifted in specific domains: cybersecurity safeguards are removed for all Glasswing participants, while biology safeguards are additionally removed for approved biology-track participants. Succeeds Claude Mythos Preview with significantly reduced pricing ($10/$50 per MTok input/output vs. $25/$125 for Mythos Preview), a 1M-token context window, 128k max output tokens, adaptive thinking always on (raw chain of thought never returned), vision, tool use, structured outputs, and the effort parameter for controlling thinking depth. Extended thinking with manual budget_tokens is not supported. For general-availability access to Mythos-class capability, see Claude Fable 5.
FAQ
What is the context window for Claude Mythos 5 on GCP Vertex AI?
Claude Mythos 5 supports a 1m token context window on GCP Vertex AI.
How does GCP Vertex AI compare to other Claude Mythos 5 providers?
Claude Mythos 5 is available from 3 providers. The cheapest input pricing is $10.00/1M tokens from Anthropic.
Who created Claude Mythos 5?
Claude Mythos 5 was created by Anthropic as part of the Claude Mythos model family.
Is Claude Mythos 5 open source?
Claude Mythos 5 is not open source; the seed data lists it as proprietary.