Add GPT-5.5 and GPT-5.5 pro model documentation (#55795)

## Summary

- Add pricing table entries for GPT-5.5 and GPT-5.5 pro
- Add context window entries for GPT-5.5/5.5 pro (272k)
- Fix context window values for all OpenAI models from 400k to 272k to
match actual cloud-enforced limit
- Update student plan note to exclude GPT-5.5 pro
- Update page description

Follows up on #54820 which added code support for GPT-5.5 models.

The 272k limit is enforced in the cloud due to context-tiered pricing
not yet being implemented.

## Test plan

- [ ] Verify pricing matches cloud repo configuration
- [ ] Check docs render correctly

Release Notes:

- N/A
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@ -1,13 +1,13 @@
---
title: AI Models and Pricing - Zed
description: AI models available via Zed Pro including Claude, GPT-5.4, Gemini 3.1 Pro, and Grok. Pricing, context windows, and tool call support.
description: AI models available via Zed Pro including Claude, GPT-5.5, Gemini 3.1 Pro, and Grok. Pricing, context windows, and tool call support.
---
# Models
Zed's plans offer hosted versions of major LLMs with higher rate limits than direct API access. Model availability is updated regularly. To use your own API keys instead, see [LLM Providers](./llm-providers.md). For general setup, see [Configuration](./configuration.md).
> **Note:** Claude Opus models and GPT-5.4 pro are not available on the [Student plan](./plans-and-usage.md#student).
> **Note:** Claude Opus models, GPT-5.5 pro, and GPT-5.4 pro are not available on the [Student plan](./plans-and-usage.md#student).
| Model | Provider | Token Type | Provider Price per 1M tokens | Zed Price per 1M tokens |
| ---------------------- | --------- | ------------------- | ---------------------------- | ----------------------- |
@ -35,6 +35,11 @@ Zed's plans offer hosted versions of major LLMs with higher rate limits than dir
| | Anthropic | Output | $5.00 | $5.50 |
| | Anthropic | Input - Cache Write | $1.25 | $1.375 |
| | Anthropic | Input - Cache Read | $0.10 | $0.11 |
| GPT-5.5 pro | OpenAI | Input | $30.00 | $33.00 |
| | OpenAI | Output | $180.00 | $198.00 |
| GPT-5.5 | OpenAI | Input | $5.00 | $5.50 |
| | OpenAI | Output | $30.00 | $33.00 |
| | OpenAI | Cached Input | $0.50 | $0.55 |
| GPT-5.4 pro | OpenAI | Input | $30.00 | $33.00 |
| | OpenAI | Output | $180.00 | $198.00 |
| GPT-5.4 | OpenAI | Input | $2.50 | $2.75 |
@ -102,13 +107,15 @@ A context window is the maximum span of text and code an LLM can consider at onc
| Claude Sonnet 4.5 | Anthropic | 200k |
| Claude Sonnet 4.6 | Anthropic | 1M |
| Claude Haiku 4.5 | Anthropic | 200k |
| GPT-5.4 pro | OpenAI | 400k |
| GPT-5.4 | OpenAI | 400k |
| GPT-5.3-Codex | OpenAI | 400k |
| GPT-5.2 | OpenAI | 400k |
| GPT-5.2-Codex | OpenAI | 400k |
| GPT-5 mini | OpenAI | 400k |
| GPT-5 nano | OpenAI | 400k |
| GPT-5.5 pro | OpenAI | 272k input / 400k total |
| GPT-5.5 | OpenAI | 272k input / 400k total |
| GPT-5.4 pro | OpenAI | 272k input / 400k total |
| GPT-5.4 | OpenAI | 272k input / 400k total |
| GPT-5.3-Codex | OpenAI | 272k input / 400k total |
| GPT-5.2 | OpenAI | 272k input / 400k total |
| GPT-5.2-Codex | OpenAI | 272k input / 400k total |
| GPT-5 mini | OpenAI | 272k input / 400k total |
| GPT-5 nano | OpenAI | 272k input / 400k total |
| Gemini 3.1 Pro | Google | 200k |
| Gemini 3 Flash | Google | 200k |
| Grok 4 | X.ai | 128k |