Unofficial calculator

Percent in. Human estimate out.

GPT-5.6 SolUpdated July 2026Max / Ultra / Extra High

Windsurf / Devin Usage Calculator

Estimate Windsurf or Devin quota units and agent runs left from the remaining percentage you see, with adjustments for Cascade, cloud agents, Devin CLI and model choice.

Build your estimate

Pick a platform, match the window it shows, then read the likely range.

Model: Auto / not sureClaude Fable 5 supportedMax / Ultra / Extra High

Usage setup

Match what your provider shows before reading the estimate.

Live estimate

Remaining allowance

Time until reset

Your estimate

ProMonthly

Around 325 Windsurf prompt credits/agent usage left

Based on 65% remaining in the monthly window.

Used 35%Remaining 65%

Remaining

65%

Used

35%

Likely range

244-423 Windsurf prompt credits/agent usage

Estimate

325 Windsurf prompt credits/agent usage

Safe pace

0-1 Windsurf prompt credits/agent usage/hour

Status: NormalReliability: Medium-high

You still have reasonable margin, but avoid wasting usage.

Main factors

Windsurf starts from monthly prompt credits and applies each model's credit rate. Devin agent sessions remain less predictable.

Limit basis: Windsurf monthly prompt credits where published. Devin sessions use a separate complexity-based quota, so Devin estimates have lower confidence.

Windsurf prompt credits are more predictable than Devin agent sessions, which use complexity-based quota.

This tool is not affiliated with OpenAI, Anthropic, Google, Perplexity, Cursor, Windsurf or Devin. Results are unofficial estimates based on the remaining percentage and options you enter. Real limits can vary by plan, model, feature, system capacity, context length, files, task complexity and provider changes. API cost references are not subscription charges.

Popular setups

Jump straight to the estimate you need

These are the setups people most often compare when a provider shows a percentage instead of a simple count.

GPT-5.6 / CodexSol reasoning, Extra High, Max and Ultra agent modes.Claude Max / Fable 5Pro, Max 5x, Max 20x and task-aware Fable 5 estimates.Gemini UltraAI Pro, Ultra tiers and Deep Think.Cursor UltraAgent, background and Max Mode estimates.

From Percent To Prompts

The calculator turns a vague remaining percentage into an easier estimate of prompts, messages, coding tasks or agent runs left.

Start With Percent Left

Use the remaining percentage your AI tool shows, not the percentage already used.

Match The Window

Choose the reset window, plan and platform so the estimate uses the closest preset.

Read Human Units

See estimated Codex tasks, ChatGPT messages, Claude messages or similar usage labels.

FAQ

Quick answers about how the estimator treats remaining percentage, reset windows and unofficial AI usage ranges.

Does this calculate exact tokens?

No. It estimates prompts, tasks, messages or usage units from your remaining percentage.

Why is it approximate?

AI platforms use dynamic limits based on plan, model, system capacity, context, files and task complexity.

What does remaining percentage mean?

It is the percentage the platform shows as remaining, not the percentage already used.

Is this official?

No. It is an independent estimator.

Other calculators

This tool is not affiliated with OpenAI, Anthropic, Google, Perplexity, Cursor, Windsurf or Devin. Results are unofficial estimates based on the remaining percentage and options you enter. Real limits can vary by plan, model, feature, system capacity, context length, files, task complexity and provider changes. API cost references are not subscription charges.