Claude Opus 4.8
Claude Opus 4.8 is designed for high-complexity text analysis and consequential writing. Kyeo AI offers text-only chat with up to 20,000 characters per message and an explicit 4,096-token maximum output.
At a glance
What is this model like?
A conversation can include the 40 most recent submitted messages. Before creation, the site reserves credits against a conservative token bound for the full input and maximum output. A successful standard or SSE response settles using reported actual credits: any excess reservation is returned, while missing or over-reservation usage enters manual reconciliation.
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.
Start with a small representative sample when mistakes or rework would be expensive and the task requires balancing many constraints.
For routine summaries and Q&A, compare Sonnet 5 or an available earlier Sonnet first.
Legal, medical, financial, and time-sensitive claims still require trusted sources and qualified human review.
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.
Flagship value comes from reducing rework
Site limits are more specific than vendor capabilities
Capabilities
Complex text reasoning
Long-form organization
Multi-turn collaboration
Use cases
Board memos
Contract or proposal review
Research synthesis
Prompt tips
Provide evaluation criteria first
Ask it to label uncertainty
Manage the output budget
Why choose it
What to know first
Adjustable parameters
Quickly assess whether this model fits your use case.
Credit usage
400 credits per million input tokens and 2,000 credits per million output tokens; final settlement uses the credits reported by the response.
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 Fable 5
Claude Fable 5 is designed for demanding narrative development and creative collaboration. Kyeo AI offers text-only access with a 4,096-token maximum output and sends no tool or attachment fields.
Claude Sonnet 5
Claude Sonnet 5 is the more balanced Claude candidate in this batch for research, code explanation, and structured writing. Its maximum output on this site is 4,096 tokens.
Claude Opus 5
Claude Opus 5 is a flagship candidate for high-complexity text work. Kyeo AI limits each message to 20,000 characters, includes the 40 most recent submitted messages, and caps output at 4,096 tokens.
Sources
Content is based on model documentation, feature references, and the settings available on Kyeo AI.
This site integrates Claude Opus 4.8 through a text-only Messages contract. Before creation, it reserves against a conservative bound for the full conversation plus a 4,096-token maximum output, then settles against the credits reported by the response.
Records text messaging, the 4,096-token maximum output, token rates, and actual-credit settlement.