## 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