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HomeDocsClaude Developer Platform 12 Oct 2026
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125125 
126126 The version of the Claude API you want to use.
127127 
128 Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
128 Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
129129 
130130- `"x-api-key": optional string`
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266266 
267267 The version of the Claude API you want to use.
268268 
269 Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
269 Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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271271- `"x-api-key": optional string`
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495495 The version of the Claude API you want to use.
496496 
497 Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
497 Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
498498 
499499- `"x-api-key": optional string`
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928928 The version of the Claude API you want to use.
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930 Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
930 Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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932932- `"x-api-key": optional string`
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10141014 The version of the Claude API you want to use.
10151015 
1016 Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
1016 Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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10181018- `"x-api-key": optional string`
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10651065 
10661066 The version of the Claude API you want to use.
10671067 
1068 Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
1068 Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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10701070- `"x-api-key": optional string`
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10991099 
11001100 The version of the Claude API you want to use.
11011101 
1102 Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
1102 Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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11041104- `"x-api-key": optional string`
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11751175 
11761176 The version of the Claude API you want to use.
11771177 
1178 Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
1178 Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning?sdk_languages=http).
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11801180- `"x-api-key": optional string`
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