Weave Router vs Cognition Adaptive: which model router fits your team?
Both route coding prompts to the right model. Cognition's Adaptive router and Devin Fusion work inside Devin and Windsurf. Weave Router works inside Codex, Claude Code, and Cursor, the tools your team already uses, and optimizes quality-per-token on every prompt. Here's the full breakdown.
The short version
Weave Router routes each prompt to the best quality-per-token model inside Codex, Claude Code, and Cursor. Cognition's Adaptive picks the model it predicts will perform best, but only inside Devin and Windsurf.
Teams typically choose Weave Router when they want smart routing across the coding tools they already use, with source code available and a 5-minute setup. Teams typically choose Adaptive when they've standardized on the Cognition ecosystem.
At a glance
How Weave Router and Cognition Adaptive compare
Compare
Weave Router
Cognition Adaptive (cognition.com)
Core approach
Routes every prompt to the best quality-per-token model
Predicts the best-performing model per prompt; Devin Fusion pairs a frontier agent with a cheaper sidekick
Where it runs
Inside Codex, Claude Code, and Cursor
Inside Devin and Windsurf only
Tool lock-in
None: works with the tools your team already uses
Requires working in Cognition's products
Model coverage
Frontier and efficient models across major providers
Cognition-selected models, including its own SWE model family
Time to value
5-minute setup; free to start
Toggle on inside Devin or Windsurf settings
Source availability
Source code available
Proprietary routing logic
Cost story
Roughly doubles how far a token budget goes on coding work
Consumes fewer tokens than always picking a frontier model
Getting started
Self-serve at router.workweave.ai, free to start
Requires a Devin or Windsurf subscription
What is Weave Router?
Weave Router is the prompt router that doubles your token runway. It routes each prompt to the best quality-per-token model, right inside the tools your engineers already use: Codex, Claude Code, and Cursor. Easy prompts stop paying frontier prices and hard prompts still get frontier models, so the same token budget ships roughly twice as much work. Setup takes about five minutes, the source code is available, and it's free to get started. Weave Router is built by Weave, the engineering intelligence platform trusted by 500+ organizations, from seed-stage startups to Fortune 100 companies.
What is Cognition Adaptive?
Adaptive is Cognition's intelligent model router, built into Devin and Windsurf. It analyzes each prompt and routes it to the model it predicts will deliver the best result, often consuming fewer tokens than manually picking a frontier model for everything. Cognition has also shipped Devin Fusion, which runs a frontier-model agent alongside a cheaper sidekick agent and delegates tasks between them. It's genuinely capable routing, if you live in Devin or Windsurf. If your engineers work in Codex, Claude Code, or Cursor, Adaptive can't route a single prompt for them.
The key difference
Routing for one ecosystem vs. routing for your tools
Cognition's approach
Adaptive and Devin Fusion are features of Cognition's products. To benefit, your team works in Devin or Windsurf, uses the models Cognition selects, and trusts routing logic you can't inspect. That's a fine deal if you've standardized on Cognition, and no help at all if you haven't.
Weave Router's approach
Weave Router is a router first, not a feature of an IDE. It drops into Codex, Claude Code, and Cursor, scores every prompt, and routes it to the best quality-per-token model across providers. Source code is available, so the routing logic is yours to inspect.
Your router should follow your engineers' tools, not require new ones.
Why Weave Router
Why teams choose Weave Router over Cognition Adaptive
Works with the tools you have
Your engineers keep using Codex, Claude Code, and Cursor. Weave Router routes their prompts without changing a single workflow.
No ecosystem lock-in
Keep choosing your own IDEs, agents, and models. Weave Router routes across providers instead of steering you toward one vendor's stack.
Quality-per-token on every prompt
Every prompt is scored and routed for the best quality per token spent, so easy work stops paying frontier prices.
Source code available
Adaptive's routing is a black box inside Cognition's products. Weave Router's source is available for your team to inspect.
Doubles your token runway
Teams take the same token budget roughly twice as far on real coding workloads, across every tool at once.
Free to start, no new subscription
No Devin or Windsurf seat required. Sign up at router.workweave.ai and route your first prompts today.
When Cognition Adaptive might be the better fit
We'd rather you pick the right tool than just pick us. If your team has standardized on Devin for autonomous work or Windsurf as its IDE, Adaptive is already built in and Devin Fusion is a clever way to keep frontier-level output at lower cost. Turn them on. But if your engineers live in Codex, Claude Code, or Cursor, Cognition's routing can't reach them, and switching IDEs is a big price to pay for a router. Routing the tools you already use is exactly what Weave Router was built for.
Frequently asked questions
What's the main difference between Weave Router and Cognition Adaptive?
Adaptive is a routing feature inside Cognition's products, Devin and Windsurf. Weave Router is a standalone prompt router that works inside Codex, Claude Code, and Cursor, routing every prompt to the best quality-per-token model across providers, with source code available.
Do my engineers have to switch IDEs or agents to use Weave Router?
No. Weave Router drops into Codex, Claude Code, and Cursor as they're already set up. Setup takes about five minutes and no workflows change.
How does Weave Router compare to Devin Fusion?
Devin Fusion pairs a frontier-model agent with a cheaper sidekick agent, but it only exists inside Devin. Weave Router achieves its savings by routing each prompt to the best quality-per-token model, and it does so inside whichever supported coding tool your team already uses.
How much can Weave Router save my team?
Weave Router routes each prompt to the best quality-per-token model, which roughly doubles how far a token budget goes on typical engineering workloads. Try the savings calculator on the Router product page for an estimate based on your usage.
Can I see how Weave Router makes routing decisions?
Yes. Weave Router's source code is available, so you can inspect the routing logic directly, something Adaptive's proprietary routing doesn't offer.
Source code available. Start taking your token budget twice as far.
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