Create a Message changedapi/messages/create
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Lines+18added
Lines−22removed
From line
1,070
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14 Aug 2026
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Recorded edits27to this page, all time
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10701070
10711071 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
10721072
1073 - `"claude-sonnet-5" or "claude-fable-5" or "claude-mythos-5" or 12 more`
1073 - `"claude-fable-5-1" or "claude-mythos-5-1" or "claude-sonnet-5" or 14 more`
10741074
10751075 The model that will complete your prompt.
10761076
10771077 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
10781078
1079 - `"claude-fable-5-1"`
1080
1081 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
1082
1083 - `"claude-mythos-5-1"`
1084
1085 Our most capable model for cybersecurity and biology research, available through trusted access programs
1086
10791087 - `"claude-sonnet-5"`
10801088
10811089 High-performance model for coding and agents
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16651673
16661674 - `type: "browser_toolset_20260801"`
16671675
1668 - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"`
1669
1670 - `"direct"`
1671
1672 - `"code_execution_20250825"`
1673
1674 - `"code_execution_20260120"`
1675
1676 - `"code_execution_20260521"`
1677
16781676 - `cache_control: optional CacheControlEphemeral or null`
16791677
16801678 Create a cache control breakpoint at this content block.
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21072105
21082106 - `type: "computer_toolset_20260801"`
21092107
2110 - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"`
2111
2112 - `"direct"`
2113
2114 - `"code_execution_20250825"`
2115
2116 - `"code_execution_20260120"`
2117
2118 - `"code_execution_20260521"`
2119
21202108 - `cache_control: optional CacheControlEphemeral or null`
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21222110 Create a cache control breakpoint at this content block.
from line 3743
37553743
37563744 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
37573745
3758 - `"claude-sonnet-5" or "claude-fable-5" or "claude-mythos-5" or 12 more`
3746 - `"claude-fable-5-1" or "claude-mythos-5-1" or "claude-sonnet-5" or 14 more`
37593747
37603748 The model that will complete your prompt.
37613749
37623750 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
3751
3752 - `"claude-fable-5-1"`
3753
3754 Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows
3755
3756 - `"claude-mythos-5-1"`
3757
3758 Our most capable model for cybersecurity and biology research, available through trusted access programs
37633759
37643760 - `"claude-sonnet-5"`
37653761
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