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What is Step 5 Preview?

Step 5 Preview epitomizes the apex of StepFun’s offerings for agentic tasks, specifically designed for practical applications in the realms of software engineering and professional knowledge, with particular excellence in financial settings. This model is adept at processing text, images, and videos, featuring an impressive 1M-token context window that suits tasks requiring extensive data, tool utilization, and continuous advancement toward specific objectives. It can effectively analyze extensive documents, amalgamate information from diverse sources, and leverage conversation threads for efficient cross-document queries and research organization. In the field of programming and software development, it showcases proficiency in a range of programming languages, assisting with debugging, code adjustments, verification tasks, and test generation. Moreover, its sophisticated multi-step agent capabilities allow applications to leverage tools for information retrieval, document analysis, detailed research, and the development of analytical reports. The model's multimodal understanding enables it to integrate images, videos, and text, facilitating tasks like chart analysis and responding to queries based on screenshots. This extensive suite of capabilities not only enhances productivity but also solidifies Step 5 Preview as an essential tool for professionals across a multitude of industries, ensuring they remain at the forefront of their respective fields.

What is Claude Fable 5.1?

Claude Fable 5.1 is an advanced general-purpose AI model from Anthropic focused on coding, scientific research, knowledge work, business processes, and long-horizon agentic reasoning. It is the generally available counterpart to Claude Mythos 5.1, which uses the same underlying model but is offered with different safeguards for vetted cybersecurity and life sciences users. Compared with Claude Fable 5, Fable 5.1 shows stronger performance across agentic coding, research, computer use, multidisciplinary reasoning, business workflow automation, and other complex benchmarks. The model is designed to remain effective during long-running tasks that involve planning, tool use, repeated verification, code modification, research, and multi-step decision making. In software engineering scenarios, it can investigate difficult bugs, trace problems across large codebases, perform code review, and work through complex implementation tasks with less supervision. Anthropic also positions Fable 5.1 as a stronger research model, with demonstrated capabilities in scientific analysis, computational modeling, and other technically demanding workflows. Improvements to cache-read pricing reduce the cost of reusing previously processed context, making the model more economical for workflows that involve long conversations, large codebases, or repeated tool calls. Fable 5.1 introduces updated enterprise privacy and security options, including Enterprise Frontier Safeguards and zero-data-retention access for eligible customers during the rollout period. Its cybersecurity protections are designed to permit more benign defensive security work, including vulnerability discovery, while continuing to restrict higher-risk activities such as exploit development and certain penetration-testing tasks. The model is available through Claude.ai, Claude Code, Claude Cowork, the Claude API, Amazon Web Services, Google Cloud, and Microsoft Azure under the claude-fable-5-1 model identifier for API users.

Media

Media

Integrations Supported

Cherry Studio
Hermes Agent
Model Context Protocol (MCP)
OfoxAI
OpenClaw
Python
Qwen Code
Amazon Bedrock
Bash
Charlie
Claw Code
Clawd.run
IntelliJ IDEA
Microsoft Foundry
Ruby
Scala
Scalestack
Simtheory
Skymel
YAML

Integrations Supported

Cherry Studio
Hermes Agent
Model Context Protocol (MCP)
OfoxAI
OpenClaw
Python
Qwen Code
Amazon Bedrock
Bash
Charlie
Claw Code
Clawd.run
IntelliJ IDEA
Microsoft Foundry
Ruby
Scala
Scalestack
Simtheory
Skymel
YAML

API Availability

Has API

API Availability

Has API

Pricing Information

$0.04 per input
Free Version
Free Trial Offered?

Pricing Information

$10 per 1M tokens (input)
$10 per million input tokens and $50 per million output tokens
Free Version
Free Trial Offered?

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

StepFun

Date Founded

2023

Company Location

United States

Company Website

platform.stepfun.ai/docs/en/guides/models/step-5-preview

Company Facts

Organization Name

Anthropic

Date Founded

2021

Company Location

United States

Company Website

claude.ai

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