The /v1/messages endpoint provides an Anthropic Messages API-compatible interface for text generation. Use the same request format as the Anthropic Messages API: swap the base URL to https://api.unifically.com and pass any supported model ID in the model field.
Support for this endpoint depends on the model. A model that cannot serve it returns an error. /v1/chat/completions works for every LLM model except Responses-only ones.
Turns on Claude’s extended thinking and returns the thinking text as thinking blocks. Claude 4.6 and newer: { "type": "adaptive" }. Claude 4.5 models: { "type": "enabled", "budget_tokens": N }, with max_tokens greater than N. See Extended Thinking.
Content blocks. With thinking on, one or more thinking blocks come before the text block, and tool calls arrive as tool_use blocks. Read the block with type == "text" instead of assuming content[0] is text.
When stream: true, the API returns text/event-stream with Anthropic-compatible event types (message_start, content_block_start, content_block_delta, content_block_stop, message_delta, message_stop). Text arrives as text_delta; with thinking on, you also get thinking_delta and signature_delta events.
To get Claude’s thinking text, send the thinking parameter on this endpoint. On /v1/chat/completions, Claude returns only the final answer.Claude 4.6 and newer models use adaptive thinking:
Claude 4.5 models (anthropic/claude-haiku-4-5, anthropic/claude-sonnet-4-5, anthropic/claude-opus-4-5) take a token budget instead. max_tokens must be greater than budget_tokens:
{ "model": "anthropic/claude-sonnet-4-5", "max_tokens": 8000, "thinking": {"type": "enabled", "budget_tokens": 4000}, "messages": [{"role": "user", "content": "Is 1001 a prime number?"}]}
Claude Opus 5.5 rejects {"type": "enabled", "budget_tokens": ...} with a 400. Use {"type": "adaptive"}.
The response has thinking blocks before the text block:
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May also include `,_jsx(_components.code,{children:`cache_read_input_tokens`}),` and `,_jsx(_components.code,{children:`cache_creation_input_tokens`}),`.`]})}),`\n`,_jsx(Heading,{level:`3`,id:`streaming-response`,children:`Streaming Response`}),`\n`,_jsxs(_components.p,{children:[`When `,_jsx(_components.code,{children:`stream: true`}),`, the API returns `,_jsx(_components.code,{children:`text/event-stream`}),` with Anthropic-compatible event types (`,_jsx(_components.code,{children:`message_start`}),`, `,_jsx(_components.code,{children:`content_block_start`}),`, `,_jsx(_components.code,{children:`content_block_delta`}),`, `,_jsx(_components.code,{children:`content_block_stop`}),`, `,_jsx(_components.code,{children:`message_delta`}),`, `,_jsx(_components.code,{children:`message_stop`}),`). Text arrives as `,_jsx(_components.code,{children:`text_delta`}),`; with thinking on, you also get `,_jsx(_components.code,{children:`thinking_delta`}),` and `,_jsx(_components.code,{children:`signature_delta`}),` events.`]}),`\n`,_jsx(CodeBlock,{filename:``,numberOfLines:`10`,language:`shellscript`,children:_jsx(_components.pre,{className:`shiki shiki-themes github-light-default dark-plus`,style:{backgroundColor:`#ffffff`,\"--shiki-dark-bg\":`#0B0C0E`,color:`#1f2328`,\"--shiki-dark\":`#D4D4D4`},language:`shellscript`,children:_jsxs(_components.code,{language:`shellscript`,numberOfLines:`10`,children:[_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#953800`,\"--shiki-dark\":`#DCDCAA`},children:`curl`}),_jsx(_components.span,{style:{color:`#0550AE`,\"--shiki-dark\":`#569CD6`},children:` -X`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` POST`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` https://api.unifically.com/v1/messages`}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#D7BA7D`},children:` \\\\`})]}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#0550AE`,\"--shiki-dark\":`#569CD6`},children:` -H`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` \"Content-Type: application/json\"`}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#D7BA7D`},children:` \\\\`})]}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#0550AE`,\"--shiki-dark\":`#569CD6`},children:` -H`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` \"Authorization: Bearer YOUR_API_KEY\"`}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#D7BA7D`},children:` \\\\`})]}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#0550AE`,\"--shiki-dark\":`#569CD6`},children:` -H`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` \"anthropic-version: 2023-06-01\"`}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#D7BA7D`},children:` \\\\`})]}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#0550AE`,\"--shiki-dark\":`#569CD6`},children:` -d`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` '{`})]}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` \"model\": \"cursor/composer-2.5-fast\",`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` \"max_tokens\": 1024,`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` \"messages\": [{\"role\": \"user\", \"content\": \"Hello!\"}],`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` \"stream\": true`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` }'`})}),`\n`]})})}),`\n`,_jsxs(_components.p,{children:[`If an error happens after the stream has started, the HTTP status stays `,_jsx(_components.code,{children:`200`}),` and the error arrives as an `,_jsx(_components.code,{children:`error`}),` event. See `,_jsx(_components.a,{href:`/api-reference/error-handling#llm-endpoints`,children:`Error Handling`}),`.`]}),`\n`,_jsx(_components.hr,{}),`\n`,_jsx(Heading,{level:`2`,id:`extended-thinking`,children:`Extended Thinking`}),`\n`,_jsxs(_components.p,{children:[`To get Claude’s thinking text, send the `,_jsx(_components.code,{children:`thinking`}),` parameter on this endpoint. On `,_jsx(_components.a,{href:`/api-reference/v1-chat-completions#reasoning`,children:_jsx(_components.code,{children:`/v1/chat/completions`})}),`, Claude returns only the final answer.`]}),`\n`,_jsx(_components.p,{children:`Claude 4.6 and newer models use adaptive thinking:`}),`\n`,_jsx(CodeBlock,{filename:``,numberOfLines:`12`,language:`shellscript`,children:_jsx(_components.pre,{className:`shiki shiki-themes github-light-default dark-plus`,style:{backgroundColor:`#ffffff`,\"--shiki-dark-bg\":`#0B0C0E`,color:`#1f2328`,\"--shiki-dark\":`#D4D4D4`},language:`shellscript`,children:_jsxs(_components.code,{language:`shellscript`,numberOfLines:`12`,children:[_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#953800`,\"--shiki-dark\":`#DCDCAA`},children:`curl`}),_jsx(_components.span,{style:{color:`#0550AE`,\"--shiki-dark\":`#569CD6`},children:` -X`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` 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\\\\`})]}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#0550AE`,\"--shiki-dark\":`#569CD6`},children:` -H`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` \"anthropic-version: 2023-06-01\"`}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#D7BA7D`},children:` \\\\`})]}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#0550AE`,\"--shiki-dark\":`#569CD6`},children:` -d`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` '{`})]}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` \"model\": \"anthropic/claude-opus-5-5\",`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` \"max_tokens\": 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`,_jsx(_components.code,{children:`anthropic/claude-sonnet-4-5`}),`, `,_jsx(_components.code,{children:`anthropic/claude-opus-4-5`}),`) take a token budget instead. `,_jsx(_components.code,{children:`max_tokens`}),` must be greater than `,_jsx(_components.code,{children:`budget_tokens`}),`:`]}),`\n`,_jsx(CodeBlock,{filename:``,numberOfLines:`6`,language:`json`,children:_jsx(_components.pre,{className:`shiki shiki-themes github-light-default dark-plus`,style:{backgroundColor:`#ffffff`,\"--shiki-dark-bg\":`#0B0C0E`,color:`#1f2328`,\"--shiki-dark\":`#D4D4D4`},language:`json`,children:_jsxs(_components.code,{language:`json`,numberOfLines:`6`,children:[_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:`{`})}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#116329`,\"--shiki-dark\":`#9CDCFE`},children:` 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`,_jsx(_components.code,{children:`anthropic/claude-sonnet-4-5`}),`, `,_jsx(_components.code,{children:`anthropic/claude-opus-4-5`}),`) take a token budget instead. `,_jsx(_components.code,{children:`max_tokens`}),` must be greater than `,_jsx(_components.code,{children:`budget_tokens`}),`:`]}),`\n`,_jsx(CodeBlock,{filename:``,numberOfLines:`6`,language:`json`,children:_jsx(_components.pre,{className:`shiki shiki-themes github-light-default dark-plus`,style:{backgroundColor:`#ffffff`,\"--shiki-dark-bg\":`#0B0C0E`,color:`#1f2328`,\"--shiki-dark\":`#D4D4D4`},language:`json`,children:_jsxs(_components.code,{language:`json`,numberOfLines:`6`,children:[_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:`{`})}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#116329`,\"--shiki-dark\":`#9CDCFE`},children:` 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style=\"color:#1F2328;--shiki-dark:#D4D4D4\">: [\u003c/span>\u003c/span>\n\u003cspan class=\"line\">\u003cspan style=\"color:#1F2328;--shiki-dark:#D4D4D4\"> {\u003c/span>\u003c/span>\n\u003cspan class=\"line\">\u003cspan style=\"color:#116329;--shiki-dark:#9CDCFE\"> \"type\"\u003c/span>\u003cspan style=\"color:#1F2328;--shiki-dark:#D4D4D4\">: \u003c/span>\u003cspan style=\"color:#0A3069;--shiki-dark:#CE9178\">\"text\"\u003c/span>\u003cspan style=\"color:#1F2328;--shiki-dark:#D4D4D4\">,\u003c/span>\u003c/span>\n\u003cspan class=\"line\">\u003cspan style=\"color:#116329;--shiki-dark:#9CDCFE\"> \"text\"\u003c/span>\u003cspan style=\"color:#1F2328;--shiki-dark:#D4D4D4\">: \u003c/span>\u003cspan style=\"color:#0A3069;--shiki-dark:#CE9178\">\"Quantum computing harnesses quantum mechanical phenomena...\"\u003c/span>\u003c/span>\n\u003cspan class=\"line\">\u003cspan style=\"color:#1F2328;--shiki-dark:#D4D4D4\"> }\u003c/span>\u003c/span>\n\u003cspan class=\"line\">\u003cspan style=\"color:#1F2328;--shiki-dark:#D4D4D4\"> ],\u003c/span>\u003c/span>\n\u003cspan class=\"line\">\u003cspan style=\"color:#116329;--shiki-dark:#9CDCFE\"> \"stop_reason\"\u003c/span>\u003cspan style=\"color:#1F2328;--shiki-dark:#D4D4D4\">: \u003c/span>\u003cspan style=\"color:#0A3069;--shiki-dark:#CE9178\">\"end_turn\"\u003c/span>\u003cspan style=\"color:#1F2328;--shiki-dark:#D4D4D4\">,\u003c/span>\u003c/span>\n\u003cspan class=\"line\">\u003cspan style=\"color:#116329;--shiki-dark:#9CDCFE\"> \"usage\"\u003c/span>\u003cspan style=\"color:#1F2328;--shiki-dark:#D4D4D4\">: {\u003c/span>\u003c/span>\n\u003cspan class=\"line\">\u003cspan style=\"color:#116329;--shiki-dark:#9CDCFE\"> \"input_tokens\"\u003c/span>\u003cspan style=\"color:#1F2328;--shiki-dark:#D4D4D4\">: \u003c/span>\u003cspan style=\"color:#0550AE;--shiki-dark:#B5CEA8\">18\u003c/span>\u003cspan style=\"color:#1F2328;--shiki-dark:#D4D4D4\">,\u003c/span>\u003c/span>\n\u003cspan class=\"line\">\u003cspan style=\"color:#116329;--shiki-dark:#9CDCFE\"> \"output_tokens\"\u003c/span>\u003cspan style=\"color:#1F2328;--shiki-dark:#D4D4D4\">: \u003c/span>\u003cspan style=\"color:#0550AE;--shiki-dark:#B5CEA8\">72\u003c/span>\u003c/span>\n\u003cspan class=\"line\">\u003cspan style=\"color:#1F2328;--shiki-dark:#D4D4D4\"> }\u003c/span>\u003c/span>\n\u003cspan class=\"line\">\u003cspan style=\"color:#1F2328;--shiki-dark:#D4D4D4\">}\u003c/span>\u003c/span>\n\u003c/code>\u003c/pre>"}],"attributes":[]}},"endpoint":{"title":"Messages API","path":"/v1/messages","servers":[{"url":"https://api.unifically.com"}],"method":"post","request":{"security":[{"title":"Bearer Auth","parameters":{"header":{"Authorization":{"type":"http","scheme":"bearer","description":"Bearer authentication header of the form `Bearer \u003ctoken>`, where `\u003ctoken>` is your auth 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