---
title: "Context window"
canonical: "https://canmyagentuse.com/features/context-window"
contentKind: "feature"
locale: "en"
description: "Record the context-window limit available in the documented product, model, and mode."
llmSummary: "Context-window records distinguish published model capacity from the limit documented for a particular product and mode. Usable input can be lower because of output reservations, instructions, tools, files, and product caps."
publishedAt: "2026-08-28T00:00:00.000Z"
updatedAt: "2026-08-28T00:00:00.000Z"
verifiedAt: "2026-08-28"
tags: ["context","context-length","tokens","limits"]
---

# Context window

Context-window records distinguish published model capacity from the limit documented for a particular product and mode. Usable input can be lower because of output reservations, instructions, tools, files, and product caps.

- HTML: https://canmyagentuse.com/features/context-window
- JSON: https://canmyagentuse.com/api/v1/features/context-window.json
- Markdown: https://canmyagentuse.com/features/context-window.md

Terminology basis: **Measured product property** — https://support.google.com/gemini/answer/16275805?hl=en.

## Current support at a glance

Context window: 2 supported, 1 partial, 0 unsupported, 28 unreviewed across 31 cataloged products.

- Reviewed current products: 3 of 31
- Supported: 2
- Partial: 1
- Unsupported: 0
- Unreviewed: 28
- Not applicable: 0

Unknown or unreviewed means insufficient published evidence; it does not mean unsupported.

“Context length” is not one provider-wide number. The catalog records the exact harness, selected model or mode, advertised total context window, maximum accepted input when separately documented, reserved output budget, and observation date. Tool definitions, hidden instructions, memory, file extraction, images, video frames, and previous turns may all consume the same budget.

A sourced cell should carry the numeric limit and unit in its evidence note or structured qualifier. Mark it partial when the harness supports the model but enforces a lower cap, exposes only a qualitative label, or dynamically routes among models with different limits. Do not infer a web, desktop, editor, or CLI limit from an API model card unless the harness documentation explicitly adopts it.

Useful conformance work tests boundary behavior: rejection, truncation, silent omission, compaction, retrieval, and “lost in the middle” quality are different outcomes. A large accepted input is not proof that every supplied token remains equally influential.

## Catalog context

- Category: [models-context](/categories/models-context.md)
- Terminology basis: Measured product property
- Aliases: context length, token limit, input token limit, context size, long context
- Family: [Models and context](/features/models-and-context.md)
- Siblings: [Automatic context compaction](/features/automatic-context-compaction.md), [Context compaction controls](/features/context-compaction-controls.md), [Context usage](/features/context-usage-visibility.md), [Local models](/features/local-models.md), [Model fallback](/features/model-fallback.md), [Model selection](/features/model-selection.md), [Output token limit](/features/output-token-limit.md), [Prompt cache controls](/features/prompt-cache-controls.md), [Prompt cache telemetry](/features/prompt-cache-telemetry.md), [Prompt caching](/features/prompt-cache-reuse.md), [Reasoning effort controls](/features/reasoning-effort-controls.md)

## Compatibility assertions

Unknown means insufficient published evidence; it does not mean unsupported.

### ChatGPT (web)

- Harness: [ChatGPT](/harnesses/chatgpt-web.md)
- current: **Unknown**
- preview: **Unknown**

### Claude (web)

- Harness: [Claude](/harnesses/claude-web.md)
- current: **Unknown**
- preview: **Unknown**

### Gemini (web)

- Harness: [Gemini](/harnesses/gemini-web.md)
- current: **Supported**
  - Target: hosted-observation — 2026-08-28 Gemini Apps limits documentation observation; observed 2026-08-28
  - Environment: hosted-default
  - Constraint (plan): 32k tokens without an AI plan; 128k with AI Plus; 1 million with AI Pro or AI Ultra
  - Constraint (runtime): the published window is shared by prompt, chat, and uploaded content and is not a guarantee of uniform attention quality
  - Evidence: [Google — Gemini Apps limits and context windows](https://support.google.com/gemini/answer/16275805?hl=en) — documented; observed 2026-08-28
  - Qualification note 1: Evidence checked 2026-08-28: Google publishes Gemini Apps context windows of 32k tokens without an AI plan, 128k with AI Plus, and 1 million with AI Pro or AI Ultra.
- preview: **Unknown**

### Copilot (web)

- Harness: [Copilot](/harnesses/copilot-web.md)
- current: **Unknown**
- preview: **Unknown**

### Grok (web)

- Harness: [Grok](/harnesses/grok-web.md)
- current: **Unknown**
- preview: **Unknown**

### Grok Bot (desktop)

- Harness: [Grok Bot](/harnesses/grok-bot-desktop.md)
- current: **Unknown**

### Perplexity (web)

- Harness: [Perplexity](/harnesses/perplexity-web.md)
- current: **Unknown**
- preview: **Unknown**

### Le Chat (web)

- Harness: [Le Chat](/harnesses/le-chat.md)
- current: **Unknown**
- preview: **Unknown**

### Devin (web)

- Harness: [Devin](/harnesses/devin-web.md)
- current: **Unknown**
- preview: **Unknown**

### Replit Agent (web)

- Harness: [Replit Agent](/harnesses/replit-agent.md)
- current: **Unknown**
- preview: **Unknown**

### ChatGPT (desktop)

- Harness: [ChatGPT](/harnesses/chatgpt-desktop.md)
- current: **Unknown**
- preview: **Unknown**

### Claude (desktop)

- Harness: [Claude](/harnesses/claude-desktop.md)
- current: **Unknown**
- preview: **Unknown**

### Cursor (desktop)

- Harness: [Cursor](/harnesses/cursor.md)
- current: **Supported**
  - Target: dated-documentation — current Cursor models documentation; observed 2026-08-28
  - Environment: local-default
  - Constraint (runtime): normal mode uses 200k tokens; Max Mode extends to the selected model's maximum, with some supported models reaching 1M
  - Constraint (plan): Max Mode availability and billing depend on plan and model
  - Evidence: [Cursor — Models and context windows](https://docs.cursor.com/advanced/models) — documented; observed 2026-08-28
  - Qualification note 3: Evidence checked 2026-08-28: Cursor documents a normal 200k-token context window and Max Mode up to the maximum supported by the selected model, including models with windows up to 1M.
- preview: **Unknown**

### OpenWork Desktop (desktop)

- Harness: [OpenWork Desktop](/harnesses/openwork-desktop.md)
- current: **Unknown**

### Copilot Chat (desktop)

- Harness: [Copilot Chat](/harnesses/vscode-copilot.md)
- current: **Unknown**
- preview: **Unknown**

### Chrome WebMCP origin trial (desktop)

- Harness: [Chrome WebMCP origin trial](/harnesses/chrome-webmcp-preview.md)
- current: **Unknown**

### Windsurf (desktop)

- Harness: [Windsurf](/harnesses/windsurf.md)
- current: **Unknown**
- preview: **Unknown**

### Zed Agent (desktop)

- Harness: [Zed Agent](/harnesses/zed-agent.md)
- current: **Unknown**
- preview: **Unknown**

### Continue (desktop)

- Harness: [Continue](/harnesses/continue.md)
- current: **Unknown**
- preview: **Unknown**

### Cline (desktop)

- Harness: [Cline](/harnesses/cline.md)
- current: **Unknown**
- preview: **Unknown**

### JetBrains AI (desktop)

- Harness: [JetBrains AI](/harnesses/jetbrains-ai.md)
- current: **Unknown**
- preview: **Unknown**

### Warp (desktop)

- Harness: [Warp](/harnesses/warp.md)
- current: **Unknown**
- preview: **Unknown**

### Claude CLI (cli)

- Harness: [Claude CLI](/harnesses/claude-cli.md)
- current: **Partial**
  - Target: dated-documentation — current Claude Code documentation; observed 2026-08-28
  - Environment: local-default
  - Constraint (plan): Opus with 1M context is included on Max, Team, and Enterprise; Pro requires usage credits, and Sonnet 1M requires credits on subscription plans
  - Constraint (runtime): the [1m] model suffix selects an eligible 1M variant; effective input remains lower after system, tools, history, and output reservations
  - Evidence: [Anthropic — Claude Code model configuration](https://code.claude.com/docs/en/model-config) — documented; observed 2026-08-28
  - Qualification note 2: Evidence checked 2026-08-28: Anthropic documents 1 million-token Claude Code variants and plan/model eligibility; this is not a claim that every Claude Code session receives 1M context.
- preview: **Unknown**

### ChatGPT CLI (cli)

- Harness: [ChatGPT CLI](/harnesses/chatgpt-cli.md)
- current: **Unknown**
- preview: **Unknown**

### Codex CLI (cli)

- Harness: [Codex CLI](/harnesses/codex-cli.md)
- current: **Unknown**
- preview: **Unknown**

### OpenCode (cli)

- Harness: [OpenCode](/harnesses/opencode.md)
- current: **Unknown**
- preview: **Unknown**

### Gemini CLI (cli)

- Harness: [Gemini CLI](/harnesses/gemini-cli.md)
- current: **Unknown**
- preview: **Unknown**

### Aider (cli)

- Harness: [Aider](/harnesses/aider.md)
- current: **Unknown**
- preview: **Unknown**

### Goose (cli)

- Harness: [Goose](/harnesses/goose.md)
- current: **Unknown**
- preview: **Unknown**

### Copilot CLI (cli)

- Harness: [Copilot CLI](/harnesses/copilot-cli.md)
- current: **Unknown**
- preview: **Unknown**

### Amp (cli)

- Harness: [Amp](/harnesses/amp-cli.md)
- current: **Unknown**
- preview: **Unknown**