handling-stop-reasons changedbuild-with-claude/handling-stop-reasons
Nearest release: v2.1.318, 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.
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Lines+10added
Lines−10removed
From line
55
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First seen
14 Aug 2026
this site's first read of the page
Recorded edits26to this page, all time
The whole hunk
from line 55, old and new numbered
/
from line 55
5555 ```bash cURL
5656 curl https://api.anthropic.com/v1/messages \
5757 -H "x-api-key: $ANTHROPIC_API_KEY" \
58 -H "anthropic-version: 2023-06-01" \
58 -H "anthropic-version: 2026-10-21" \
5959 -H "content-type: application/json" \
6060 -d '{
6161 "model": "claude-opus-5-5",
from line 740
740740 ```bash cURL
741741 curl https://api.anthropic.com/v1/messages \
742742 -H "x-api-key: $ANTHROPIC_API_KEY" \
743 -H "anthropic-version: 2023-06-01" \
743 -H "anthropic-version: 2026-10-21" \
744744 -H "content-type: application/json" \
745745 -d '{
746746 "model": "claude-opus-5-5",
from line 1052
10521052 ```bash cURL
10531053 curl https://api.anthropic.com/v1/messages \
10541054 -H "x-api-key: $ANTHROPIC_API_KEY" \
1055 -H "anthropic-version: 2023-06-01" \
1055 -H "anthropic-version: 2026-10-21" \
10561056 -H "content-type: application/json" \
10571057 -d '{
10581058 "model": "claude-opus-5-5",
from line 1196
11961196 ```bash cURL
11971197 curl https://api.anthropic.com/v1/messages \
11981198 -H "x-api-key: $ANTHROPIC_API_KEY" \
1199 -H "anthropic-version: 2023-06-01" \
1199 -H "anthropic-version: 2026-10-21" \
12001200 -H "content-type: application/json" \
12011201 -d '{
12021202 "model": "claude-opus-5-5",
from line 1539
15391539 # on the response and re-POST with the assistant content appended.
15401540 curl https://api.anthropic.com/v1/messages \
15411541 -H "x-api-key: $ANTHROPIC_API_KEY" \
1542 -H "anthropic-version: 2023-06-01" \
1542 -H "anthropic-version: 2026-10-21" \
15431543 -H "content-type: application/json" \
15441544 -d '{
15451545 "model": "claude-opus-5-5",
from line 1757
17571757 ```bash cURL
17581758 curl https://api.anthropic.com/v1/messages \
17591759 -H "x-api-key: $ANTHROPIC_API_KEY" \
1760 -H "anthropic-version: 2023-06-01" \
1760 -H "anthropic-version: 2026-10-21" \
17611761 -H "content-type: application/json" \
17621762 -d '{
17631763 "model": "claude-opus-5-5",
from line 1894
18941894</CodeGroup>
18951895
18961896<Tip>
1897 If you encounter `refusal` stop reasons frequently while using Claude Sonnet 4.5 ([deprecated](https://platform.claude.com/docs/en/about-claude/model-deprecations)) or Claude Opus 4.1 (the latter [retired, except on Bedrock and Claude Models on Google Cloud (Google managed)](https://platform.claude.com/docs/en/about-claude/model-deprecations)), you can try updating your API calls to use Haiku 4.5 (`claude-haiku-4-5-20251001`), which has different usage restrictions. Learn more about [understanding Sonnet 4.5’s API safety filters](https://support.claude.com/en/articles/12449294-understanding-sonnet-4-5-s-api-safety-filters).
1897 If you encounter `refusal` stop reasons frequently while using Claude Sonnet 4.5 ([deprecated](https://platform.claude.com/docs/en/about-claude/model-deprecations)) or Claude Opus 4.1 (the latter [retired, except on Claude Models on Google Cloud (Google managed) and Amazon Bedrock](https://platform.claude.com/docs/en/about-claude/model-deprecations)), you can try updating your API calls to use Claude Haiku 4.5 (`claude-haiku-4-5-20251001`), which has different usage restrictions. Learn more about [understanding Sonnet 4.5’s API safety filters](https://support.claude.com/en/articles/12449294-understanding-sonnet-4-5-s-api-safety-filters).
18981898</Tip>
18991899
19001900On a refusal, the [`stop_details`](https://platform.claude.com/docs/en/api/messages/create#message.stop_details) object identifies the policy category that triggered it. The categories and the full refusal response shape are covered in [What a refusal looks like](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback#refusal-response). `stop_details` is `null` for all stop reasons other than `refusal`.
from line 1913
19131913 ```bash cURL
19141914 curl https://api.anthropic.com/v1/messages \
19151915 -H "x-api-key: $ANTHROPIC_API_KEY" \
1916 -H "anthropic-version: 2023-06-01" \
1916 -H "anthropic-version: 2026-10-21" \
19171917 -H "content-type: application/json" \
19181918 -d '{
19191919 "model": "claude-opus-5-5",
from line 2703
27032703 # $? for errors and stop_reason for successful responses.
27042704 curl --fail-with-body https://api.anthropic.com/v1/messages \
27052705 -H "x-api-key: $ANTHROPIC_API_KEY" \
2706 -H "anthropic-version: 2023-06-01" \
2706 -H "anthropic-version: 2026-10-21" \
27072707 -H "content-type: application/json" \
27082708 -d '{
27092709 "model": "claude-opus-5-5",
from line 2917
29172917 # The message_delta event in the SSE stream carries stop_reason.
29182918 curl -N https://api.anthropic.com/v1/messages \
29192919 -H "x-api-key: $ANTHROPIC_API_KEY" \
2920 -H "anthropic-version: 2023-06-01" \
2920 -H "anthropic-version: 2026-10-21" \
29212921 -H "content-type: application/json" \
29222922 -d '{
29232923 "model": "claude-opus-5-5",
No line in this hunk matches that.