State-of-the-Art Coding
Handle multi-day migrations and complex implementations. claude mythos 5 writes its own tests and maintains focus across millions of tokens.
claude-fable-5 / file-analysis
claude mythos 5 is the premier model class for high-stakes knowledge work and autonomous coding. Available via GPTProto.com, this generation handles multi-day tasks, vision analysis, and complex reasoning with unparalleled agentic reliability.
$ 8
$ 10
file
$ 40
$ 50
text
API
Submit Task
curl --request POST "https://gptproto.com/v1/messages" \
--header "Authorization: Bearer $GPTPROTO_API_KEY" \
--header "Content-Type: application/json" \
--data '{
"model": "claude-fable-5",
"max_tokens": 1024,
"messages": [
{
"role": "user",
"content": [
{
"type": "text",
"text": "Please analyze this PDF document and provide a summary of its content"
},
{
"type": "document",
"source": {
"type": "url",
"url": "https://tos.gptproto.com/resource/gptproto.pdf"
}
}
]
}
]
}'claude mythos 5 Key Model Features
Discover the standout capabilities that make claude mythos 5 the leader in autonomous AI benchmarks for developers and researchers.
Vision-Based Analysis
Extract data from charts, tables, and diagrams. claude mythos 5 can even rebuild entire web applications based solely on visual screenshots.
Scientific Research Reasoning
Accelerate drug design and genomics. This model matches skilled human scientists in protein design and produces novel, compelling hypotheses.
Autonomous Long-Horizon Agents
Run tasks for days using claude mythos 5. It plans, delegates to sub-agents, and verifies outputs autonomously with minimal human oversight needed.
How to Get a claude-fable-5 API Key
Getting a claude-fable-5 API key takes four steps and a few minutes. Create a free GPTProto account, add credits, generate your key, and make your first call — at $8 / $40 it's a cheaper claude-fable-5 API key than going direct, and one key works across every model on the platform. Full claude-fable-5 Documentation is in the docs.
Sign up
Create your free GPT Proto account to begin. You can set up an organization for your team at any time.
Top up
Your balance can be used across all models on the platform, including claude-fable-5, giving you the flexibility to experiment and scale as needed.
Generate your API key
In your dashboard, create an API key — you'll need it to authenticate when making requests to claude-fable-5.
Make your first API call
Use your API key with our sample code to send a request to claude-fable-5 via GPT Proto and see instant AI-powered results.
claude mythos 5 Frequently Asked Questions
Get detailed answers about the claude mythos 5 class of models, including performance, pricing, and how to access its frontier-level capabilities on GPTProto.com.
How does claude mythos 5 handle autonomous work?
claude mythos 5 is designed for ambitious, long-running projects that previous models couldn't sustain. It can operate in an agent harness like claude code, planning across multiple stages and checking its own work for days at a time. This class of model is proactive, thorough, and capable of delegating to sub-agents, making it ideal for the most difficult knowledge work that requires minimal human oversight during multi-stage execution.
What are the pricing details for claude mythos?
The claude mythos 5 model is priced at $10 per million input tokens and $50 per million output tokens. This reflects a significant cost reduction compared to previous preview versions. Additionally, users can benefit from a 90% discount on input tokens through prompt caching. For specific workloads requiring residency in the United States, US-only inference is available at 1.1x pricing for both input and output token consumption.
Does claude mythos 5 include vision capabilities?
Yes, vision is a core strength of the claude mythos 5 class. It can interpret complex diagrams, charts, and nested tables within files like PDFs. In technical benchmarks, it demonstrated the ability to rebuild web apps from screenshots alone and played games like Pokemon FireRed using only raw visual input without any navigation aids. This makes it highly effective for document-heavy fields like finance, legal, and architectural analytics.
What safeguards protect the claude mythos 5 model?
To ensure safety, the claude mythos 5 generation includes robust classifiers for biology, chemistry, and cybersecurity. If a request is flagged in these domains, it automatically routes to the opus 4.8 model to prevent potential misuse in creating cyberattacks or bioweapons. This fallback system ensures a safe experience while maintaining high performance. API users only pay for the specific model used, avoiding higher costs for rerouted tasks.
Can I use claude mythos for large coding projects?
Absolutely. claude mythos 5 is the most capable model for large-scale software engineering. It excels at codebase-wide migrations, such as the 50-million-line Ruby migration performed for Stripe. The model writes its own tests, implements high-fidelity designs, and uses its vision capabilities to verify visual outputs against original project goals. It handles complex, multi-day autonomous sessions with a high degree of reliability and focus.
How does data retention work for claude mythos?
Using the mythos class models requires a 30-day data retention policy for safety monitoring. This data is not used to train new models or for any non-safety purposes. It helps defend against novel attacks and allows developers to identify and reduce false positives in safety classifiers. GPTProto.com adheres to these standards to ensure that usage remains compliant with frontier safety regulations while protecting sensitive information.