Follow Discord
Sweep 10 Nov 2026 · 02:18Z Build v2.1.322 539 read Stable v2.1.311 Latest v2.1.322 Next v2.1.322 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsClaude Developer Platform 18 Sep 2026
One change · api

thinking changedbuild-with-claude/thinking

Nearest release: v2.1.277, published 4 hours before this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Recorded here
Lines+16added
Lines−17removed
From line 1,163 where the diff opens
First seen 14 Aug 2026 this site's first read of the page
Recorded edits42to this page, all time

The whole hunk

from line 1163, old and new numbered
/
lines
from line 1163
11631163 
11641164Each model accepts `max_tokens` up to the ceiling listed here. On the [Message Batches API](https://platform.claude.com/docs/en/build-with-claude/batch-processing#extended-output-beta), the `output-300k-2026-03-24` [beta header](https://platform.claude.com/docs/en/api/beta-headers) raises that ceiling for the models with a batches ceiling listed.
11651165 
1166| Model | Max output tokens | Batches beta ceiling |
1167| :---------------- | :---------------- | :------------------- |
1168| Claude Fable 5.1 | 128K | — |
1169| Claude Mythos 5.1 | 128K | — |
1170| Claude Fable 5 | 128K | — |
1171| Claude Mythos 5 | 128K | — |
1172| Claude Opus 5 | 128K | 300K |
1173| Claude Opus 4.8 | 128K | 300K |
1174| Claude Opus 4.7 | 128K | 300K |
1175| Claude Opus 4.6 | 128K | 300K |
1176| Claude Opus 4.5 | 64K | Not available |
1177| Claude Sonnet 5 | 128K | 300K |
1178| Claude Sonnet 4.6 | 128K | 300K |
1179| Claude Sonnet 4.5 | 64K | Not available |
1180| Claude Haiku 4.5 | 64K | Not available |
1181 
1182[Claude Mythos Preview](https://anthropic.com/glasswing) accepts `max_tokens` up to 128K; the Batches beta ceiling is not available for it.
1166| Model | Max output tokens | Batches beta ceiling |
1167| :-------------------- | :---------------- | :------------------- |
1168| Claude Fable 5.1 | 128K | — |
1169| Claude Mythos 5.1 | 128K | — |
1170| Claude Fable 5 | 128K | — |
1171| Claude Mythos 5 | 128K | — |
1172| Claude Mythos Preview | 128K | Not available |
1173| Claude Opus 5 | 128K | 300K |
1174| Claude Opus 4.8 | 128K | 300K |
1175| Claude Opus 4.7 | 128K | 300K |
1176| Claude Opus 4.6 | 128K | 300K |
1177| Claude Opus 4.5 | 64K | Not available |
1178| Claude Sonnet 5 | 128K | 300K |
1179| Claude Sonnet 4.6 | 128K | 300K |
1180| Claude Sonnet 4.5 | 64K | Not available |
1181| Claude Haiku 4.5 | 64K | Not available |
11831182 
11841183See the [models overview](https://platform.claude.com/docs/en/models/overview) for limits on legacy models.
11851184 
Feedback