Claude Sonnet 4.5
Kyeo AI offers Claude Sonnet 4.5 as a text-only chat model for demanding analysis and writing, with up to 20,000 characters per message, 40 submitted messages of history, and at most 4,096 output tokens per response.
At a glance
What is this model like?
Use representative non-sensitive samples to evaluate quality, truncation, role behavior, actual token use, cache use, latency, and privacy. This page describes Kyeo AI's current product limits, not every feature available from the model vendor.
Key facts
Quickly assess whether this model fits your use case.
Also known as
The same model may appear under different names across documentation and community discussions; this list keeps them easy to search and compare.
Common questions
These practical questions focus on the task, input conditions, and result requirements you should confirm before choosing.
Selection guide
Use these decision points when choosing a model.
Use it when you have validated 4.5 prompts, output formats, or human-review benchmarks and need to reproduce old results or control migration variables.
This page is set up as the public chat entry for Claude Sonnet 4.5. That keeps the first result centered on editorial rewrites and tone-sensitive writing instead of forcing the work into a longer thread too early.
Test one structured-analysis task, one format-constrained rewrite, and one code-explanation task. Record first-pass acceptance, revision count, input and output tokens, and final credits. If a task needs current information, provide verified material separately because this route cannot search.
Popular comparisons
Compare common alternatives on the same task to clarify differences in inputs, controls, and cost.
Model comparison
Compare the current model with alternatives at a glance.
Practical usage insights
Practical guidance based on public sources, current on-site limits, and representative tasks.
Why Claude is often considered for writing and analysis
Benchmarks and real-world work measure different things
Capabilities
Bounded text chat
Settlement from actual usage
Feature scope stays explicit
Use cases
Legacy prompt regression
Structured text processing
Migration comparison
Prompt tips
Define evaluation dimensions first
Layer complex material
Verify final facts
Why choose it
What to know first
Adjustable parameters
Quickly assess whether this model fits your use case.
Credit usage
170 credits per million base input tokens and 855 per million output tokens; cache reads use 0.1× the input rate, while 5-minute and 1-hour cache writes use 1.25× and 2×.
Before batch generation, run an A/B test with the same assets across the current model and alternatives to validate quality and avoid wasting credits.
FAQ
Related models
Compare these similar candidates before deciding.
Claude Haiku 4.5
Claude Haiku 4.5 is a text-only Text chat entry on this site. Each new message is limited to 20,000 characters and a request includes only the 40 most recently submitted messages; images, web search, reasoning/thinking, and tool configuration are not available.
Claude Sonnet 4.6
Claude Sonnet 4.6 is a text-only migration baseline on Kyeo AI between Sonnet 4.5 and Sonnet 5. It is no longer Anthropic's newest Sonnet, but remains useful for rerunning established 4.6 workflows or comparing 4.5, 4.6, and newer Kyeo AI models on the same tasks. This implementation is narrower than the official platform: each new message is limited to 20,000 JavaScript characters, only the 40 most recent messages are included, and attachments, web search, thinking, and tool execution are not exposed.
Claude Opus 4.7
Kyeo AI offers Claude Opus 4.7 as a text-only chat model for demanding analysis and writing, with up to 20,000 characters per message, 40 submitted messages of history, and at most 4,096 output tokens per response.
Sources
Content is based on model documentation, feature references, and the settings available on Kyeo AI.
This page describes the current Kyeo AI experience: text-only chat, up to 20,000 characters per message, the 40 most recently submitted messages, and at most 4,096 output tokens per response. Pricing and feature claims below are limited to controls that are publicly available on this page.