Skip to content

Compare

“Which AI is best?”
is the wrong question.

There is no single best model, only better fits. This page explains the dimensions models actually differ on, and what each kind of task needs — so you can stop maintaining a mental scoreboard.

Six dimensions

What models actually differ on.

Benchmarks compress all of this into one number. Real work does not.

  • Reasoning depth

    Multi-step decisions reward models that deliberate. Simple lookups do not.

    Matters most for: Strategy, analysis, tricky code

  • Context length

    How much material a model can hold and still reason across without losing the thread.

    Matters most for: Contracts, transcripts, codebases

  • Speed

    Latency is a feature. A fast good answer often beats a slow better one.

    Matters most for: Drafting, iterating, support

  • Cost per task

    The heaviest option is rarely the right default for routine work.

    Matters most for: High-volume workflows

  • Freshness

    Training data has a cut-off. Some questions need search, not recall.

    Matters most for: Markets, news, competitors

  • Tools and execution

    Some tasks need code that runs or a document that is actually read.

    Matters most for: Engineering, data work

Task → requirement

Start from the task.

Once you describe what the work needs, the choice mostly makes itself. That is exactly the judgement Kelven is built to make on your behalf.

Long document review
Large context plus careful reading. Speed matters less than not missing a clause.
Writing in your voice
Style memory matters more than raw capability. Consistency beats cleverness.
Research with sources
Current information and synthesis — search first, then reasoning over what came back.
Code and review
Execution and verification, not confident prose about what the code probably does.
Quick answers
The lightest path that is still correct. Deliberation here is wasted time and money.
Hard decisions
Depth, plus the context of what you have already decided and why.
Kelven
  • Reasoning
  • Research
  • Coding
  • Vision
  • Tools

Light path. Fast, direct.

Guides in progress

More comparisons coming.

We are writing task-by-task guides — best AI for writing, for coding, for long documents, for research, for business workflows — plus plain-language explainers on orchestration and model selection. They will be published here as they land.

The future isn’t another AI model. It’s an intelligence layer that’s yours.

Kelven is the user-controlled intelligence layer between you and AI — with one memory that’s always yours.

No spam. Just one note when early access opens.