streaming changedbuild-with-claude/streaming
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310310The API might occasionally send [errors](https://platform.claude.com/docs/en/api/errors) in the event stream. For example, during periods of high usage, you might receive an `overloaded_error`, which would normally correspond to an HTTP 529 in a non-streaming context:
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312```sse Example error
312```text Example error
313313event: error
314314data: {"type": "error", "error": {"type": "overloaded_error", "message": "Overloaded"}}
315315```
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326326
327327A `text` content block delta looks like:
328328
329```sse Text delta
329```text Text delta
330330event: content_block_delta
331331data: {"type": "content_block_delta","index": 0,"delta": {"type": "text_delta", "text": "ello frien"}}
332332```
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339339
340340A `tool_use` content block delta looks like:
341341
342```sse Input JSON delta
342```text Input JSON delta
343343event: content_block_delta
344344data: {"type": "content_block_delta","index": 1,"delta": {"type": "input_json_delta","partial_json": "{\"location\": \"San Fra"}}}
345345```
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348348
349349### Thinking delta
350350
351When using [thinking](https://platform.claude.com/docs/en/build-with-claude/thinking#streaming-thinking) with streaming enabled, you'll receive thinking content through `thinking_delta` events. These deltas correspond to the `thinking` field of the `thinking` content blocks.
351When using [thinking with streaming enabled](https://platform.claude.com/docs/en/build-with-claude/thinking#streaming-thinking), you'll receive thinking content through `thinking_delta` events. These deltas correspond to the `thinking` field of the `thinking` content blocks.
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353353For thinking content, a special `signature_delta` event is sent just before the `content_block_stop` event. This signature is used to verify the integrity of the thinking block.
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356356
357357A typical thinking delta looks like:
358358
359```sse Thinking delta
359```text Thinking delta
360360event: content_block_delta
361361data: {"type": "content_block_delta", "index": 0, "delta": {"type": "thinking_delta", "thinking": "I need to find the GCD of 1071 and 462 using the Euclidean algorithm.\n\n1071 = 2 × 462 + 147"}}
362362```
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363363
364364The signature delta looks like:
365365
366```sse Signature delta
366```text Signature delta
367367event: content_block_delta
368368data: {"type": "content_block_delta", "index": 0, "delta": {"type": "signature_delta", "signature": "EqQBCgIYAhIM1gbcDa9GJwZA2b3hGgxBdjrkzLoky3dl1pkiMOYds..."}}
369369```
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530530 ```
531531</CodeGroup>
532532
533```sse Response
533```text Response
534534event: message_start
535535data: {"type": "message_start", "message": {"id": "msg_1nZdL29xx5MUA1yADyHTEsnR8uuvGzszyY", "type": "message", "role": "assistant", "content": [], "model": "claude-opus-5-5", "stop_reason": null, "stop_sequence": null, "usage": {"input_tokens": 25, "output_tokens": 1}}}
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872872 ```
873873</CodeGroup>
874874
875```sse Response
875```text Response
876876event: message_start
877877data: {"type":"message_start","message":{"id":"msg_014p7gG3wDgGV9EUtLvnow3U","type":"message","role":"assistant","model":"claude-opus-5","stop_sequence":null,"usage":{"input_tokens":472,"output_tokens":2},"content":[],"stop_reason":null}}
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11651165 ```
11661166</CodeGroup>
11671167
1168```sse Response
1168```text Response
11691169event: message_start
11701170data: {"type": "message_start", "message": {"id": "msg_01...", "type": "message", "role": "assistant", "content": [], "model": "claude-opus-5-5", "stop_reason": null, "stop_sequence": null}}
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13961396 ```
13971397</CodeGroup>
13981398
1399```sse Response
1399```text Response
14001400event: message_start
14011401data: {"type":"message_start","message":{"id":"msg_01G...","type":"message","role":"assistant","model":"claude-opus-5-5","content":[],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":2679,"cache_creation_input_tokens":0,"cache_read_input_tokens":0,"output_tokens":3}}}
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