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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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cache-diagnostics changedbuild-with-claude/cache-diagnostics

Nearest release: v2.1.239, published 2 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.

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Lines−16removed
From line 30 where the diff opens
First seen 14 Aug 2026 this site's first read of the page
Recorded edits13to this page, all time

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3030 ```bash cURL
3131 # Turn 1: establish the cache and opt in to diagnostics
3232 response=$(curl -sS --fail-with-body https://api.anthropic.com/v1/messages \
33 --header "x-api-key: $ANTHROPIC_API_KEY" \
34 --header "anthropic-version: 2023-06-01" \
35 --header "anthropic-beta: cache-diagnosis-2026-04-07" \
36 --header "content-type: application/json" \
37 --data '{
33 -H "x-api-key: $ANTHROPIC_API_KEY" \
34 -H "anthropic-version: 2023-06-01" \
35 -H "anthropic-beta: cache-diagnosis-2026-04-07" \
36 -H "content-type: application/json" \
37 -d '{
3838 "model": "claude-opus-5",
3939 "max_tokens": 1024,
4040 "cache_control": {"type": "ephemeral"},
from line 47
4747 
4848 # Turn 2: reference the previous turn so the API can compare prefixes
4949 curl -sS --fail-with-body https://api.anthropic.com/v1/messages \
50 --header "x-api-key: $ANTHROPIC_API_KEY" \
51 --header "anthropic-version: 2023-06-01" \
52 --header "anthropic-beta: cache-diagnosis-2026-04-07" \
53 --header "content-type: application/json" \
54 --data @- <<EOF | jq '{id, diagnostics}' # diagnostics: null means no divergence was found
50 -H "x-api-key: $ANTHROPIC_API_KEY" \
51 -H "anthropic-version: 2023-06-01" \
52 -H "anthropic-beta: cache-diagnosis-2026-04-07" \
53 -H "content-type: application/json" \
54 -d @- <<EOF | jq '{id, diagnostics}' # diagnostics: null means no divergence was found
5555 {
5656 "model": "claude-opus-5",
5757 "max_tokens": 1024,
from line 427
427427 # Turn 2: stream the response. diagnostics arrives on the message_start event;
428428 # a null value means no divergence was found.
429429 curl -sS --fail-with-body https://api.anthropic.com/v1/messages \
430 --header "x-api-key: $ANTHROPIC_API_KEY" \
431 --header "anthropic-version: 2023-06-01" \
432 --header "anthropic-beta: cache-diagnosis-2026-04-07" \
433 --header "content-type: application/json" \
434 --data @- <<EOF | jq -R 'select(startswith("data: ")) | ltrimstr("data: ") | fromjson | select(.type == "message_start") | .message.diagnostics'
430 -H "x-api-key: $ANTHROPIC_API_KEY" \
431 -H "anthropic-version: 2023-06-01" \
432 -H "anthropic-beta: cache-diagnosis-2026-04-07" \
433 -H "content-type: application/json" \
434 -d @- <<EOF | jq -R 'select(startswith("data: ")) | ltrimstr("data: ") | fromjson | select(.type == "message_start") | .message.diagnostics'
435435 {
436436 "model": "claude-opus-5",
437437 "max_tokens": 1024,
from line 1078
10781078 
10791079## Limitations
10801080 
1081* **Beta:** Field names and semantics may change before general availability.
1081* **Beta:** Field names and semantics may change while this feature is in beta.
10821082* **Claude API only:** Not available on Amazon Bedrock or Google Cloud.
10831083* **Limited retention:** Fingerprints for `previous_message_id` lookup expire after a short period. Run diagnostic comparisons between closely spaced requests.
10841084* **Same workspace:** The previous request must have been made with an API key from the same organization and workspace. To check, compare the `anthropic-workspace-id` [response header](https://platform.claude.com/docs/en/api/overview#response-headers) on the two responses.
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