Completions changedapi/completions
Nearest release: v2.1.283, published 3 hours after 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+110added
Lines−104removed
From line
145
where the diff opens
First seen
14 Aug 2026
this site's first read of the page
Recorded edits13to this page, all time
The whole hunk
from line 145, old and new numbered
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from line 145
145145
146146 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
147147
148 - `string`
149
148150 - `"claude-fable-5-1" or "claude-opus-5-5" or "claude-mythos-5-1" or 15 more`
149151
150152 The model that will complete your prompt.
from line 189
187189
188190 Powerful intelligence for long-running agents and coding
189191
190 - `"claude-mythos-preview"`
191
192 New class of intelligence, strongest in coding and cybersecurity
193
194192 - `"claude-opus-4-6"`
195193
196194 Powerful intelligence for long-running agents and coding
from line 221
223221
224222 High-performance model for agents and coding
225223
226 - `string`
224 - `"claude-mythos-preview"`
227225
226 **Deprecated**: Will reach end-of-life on June 30, 2026. Please migrate to claude-mythos-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
227
228 New class of intelligence, strongest in coding and cybersecurity
229
228230- `prompt: string`
229231
230232 The prompt that you want Claude to complete.
from line 285
283285
284286 Note that even with `temperature` of `0.0`, the results will not be fully deterministic.
285287
286 maximum: 1, minimum: 0
288 minimum: 0, maximum: 1
287289
288290- `top_k: optional number`
289291
from line 309
307309
308310 Recommended for advanced use cases only.
309311
310 maximum: 1, minimum: 0
312 minimum: 0, maximum: 1
311313
312314### Returns
313315
from line 339
337339
338340 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
339341
342 - `string`
343
340344 - `"claude-fable-5-1" or "claude-opus-5-5" or "claude-mythos-5-1" or 15 more`
341345
342346 The model that will complete your prompt.
from line 383
379383
380384 Powerful intelligence for long-running agents and coding
381385
382 - `"claude-mythos-preview"`
383
384 New class of intelligence, strongest in coding and cybersecurity
385
386386 - `"claude-opus-4-6"`
387387
388388 Powerful intelligence for long-running agents and coding
from line 415
415415
416416 High-performance model for agents and coding
417417
418 - `string`
418 - `"claude-mythos-preview"`
419419
420 **Deprecated**: Will reach end-of-life on June 30, 2026. Please migrate to claude-mythos-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
421
422 New class of intelligence, strongest in coding and cybersecurity
423
420424 - `stop_reason: string or null`
421425
422426 The reason that we stopped.
from line 490
486490
487491 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
488492
493 - `string`
494
489495 - `"claude-fable-5-1" or "claude-opus-5-5" or "claude-mythos-5-1" or 15 more`
490496
491497 The model that will complete your prompt.
from line 534
528534
529535 Powerful intelligence for long-running agents and coding
530536
531 - `"claude-mythos-preview"`
532
533 New class of intelligence, strongest in coding and cybersecurity
534
535537 - `"claude-opus-4-6"`
536538
537539 Powerful intelligence for long-running agents and coding
from line 566
564566
565567 High-performance model for agents and coding
566568
567 - `string`
569 - `"claude-mythos-preview"`
570
571 **Deprecated**: Will reach end-of-life on June 30, 2026. Please migrate to claude-mythos-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
572
573 New class of intelligence, strongest in coding and cybersecurity
568574
569575 - `stop_reason: string or null`
570576
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