Models & pricing

Claude Sonnet 5

Model ID

claude-sonnet-5

Context window

200k · up to 1M

Provider

Anthropic

Speed

Medium

Cost

Medium

Intelligence

Frontier

Claude Sonnet 5 is Anthropic's balanced frontier model available in Ask ASUME. It provides strong reasoning at a substantially lower price than Opus, making it a strong Claude choice for everyday analytical work.

Selecting Claude Sonnet 5 changes how an Ask is answered. It does not change how ASUME builds or maintains the underlying company understanding.

Strengths

Strong reasoning

Well suited to questions that require several reasoning steps, interpretation of company context, or evaluation of multiple considerations.

Capability and cost

Sonnet provides much of Anthropic's higher-tier capability while remaining substantially less expensive than Opus.

Near-Opus capability

A strong choice for demanding everyday work where Opus-level cost is difficult to justify.

Large context

Supports Asks involving substantial maintained company understanding, with context available up to 1M tokens.

Limitations

Not Anthropic's strongest option

Claude Opus 5 remains the stronger choice for the most demanding questions where maximum reasoning capability matters.

Less suited to the hardest analysis

Questions requiring extended reasoning across many competing explanations or constraints may benefit from Opus.

More expensive than lightweight options

Straightforward questions may be handled more economically by Corollary or another lower-cost model.

Available context

Maintained understanding

Uses the structured company understanding ASUME has already constructed and maintains over time. Answers come from that context rather than rebuilding the company from the beginning for every question.

Evidence & assumptions

Can use relevant evidence, sources, and explicit assumptions associated with the maintained understanding when they are made available to the Ask.

Multi-company context

Can reason across the maintained understanding of multiple companies when a question involves comparison, relationships, or portfolio-level analysis.

Available capabilities

Can use the capabilities ASUME makes available for the Ask. Availability depends on the product, workspace permissions, and the capabilities supported at the time of the request.

When to use Claude Sonnet 5

Choose Claude Sonnet 5 when you want strong Anthropic reasoning without paying the higher rate of Claude Opus 5.

Everyday deep reasoning

Use Sonnet for company questions that require meaningful analysis without necessarily requiring Anthropic's strongest model.

Evaluating evidence

Use Sonnet when several pieces of evidence or company context need to be considered together.

Comparing companies

Use Sonnet when comparing companies across several factors or interpreting differences in their needs, capabilities, constraints, or priorities.

Detailed analysis

Use Sonnet when you want substantial reasoning and a detailed answer while maintaining a better balance of capability and cost than Opus.

Pricing

Claude Sonnet 5 is a directly selectable third-party model in Ask ASUME. Usage is billed at the ASUME rates below. All prices are per million tokens.

Name	Input	Cache Write	Cache Read	Output
Claude Sonnet 5	€2.15	€2.70	€0.22	€10.75

The rates above are billed by ASUME and may differ from Anthropic's own API pricing. Choosing Claude Sonnet 5 affects only the model usage associated with the Ask.