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whit3rabbitandClaude Opus 4.6
f2e3ed15f4
Rust workspace with two crates: - translator: pure, IO-free mapping between Anthropic Messages API and OpenAI Chat Completions - proxy: axum HTTP server with auth, streaming SSE, retry/backoff, concurrency limits 169 tests passing (unit, golden fixture, integration). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
56 lines
3.0 KiB
Markdown
56 lines
3.0 KiB
Markdown
# Field Mapping: Anthropic -> OpenAI Chat Completions
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## Request Fields
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| Anthropic Field | OpenAI Field | Mapping Rule | Notes |
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| `model` | `model` | Pass through | Model name kept as-is; aliasing is config-level |
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| `max_tokens` (required) | `max_tokens` | Direct copy | |
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| `system` (string) | `messages[0]` role=developer | Wrap as developer message | Prefer `developer` over `system` for newer models |
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| `system` (blocks) | `messages[0]` role=developer | Concatenate block texts with newline | |
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| `messages[].role=user` | `messages[].role=user` | Direct | Content format differs (see below) |
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| `messages[].role=assistant` | `messages[].role=assistant` | Direct | Tool calls extracted separately |
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| `temperature` (0..1) | `temperature` (0..2) | Pass through | Anthropic range is subset of OpenAI |
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| `top_p` | `top_p` | Pass through | Same semantics |
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| `stop_sequences[]` | `stop` (string[]) | Take first 4 | OpenAI caps at 4; silent truncation |
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| `stream` | `stream` | Pass through | SSE format translation required |
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| `tools[].name` | `tools[].function.name` | Direct | |
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| `tools[].description` | `tools[].function.description` | Direct | |
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| `tools[].input_schema` | `tools[].function.parameters` | Direct (JSON Schema) | |
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| `tool_choice.type=auto` | `tool_choice="auto"` | Simple string | |
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| `tool_choice.type=any` | `tool_choice="required"` | Semantic equivalent | |
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| `tool_choice.type=none` | `tool_choice="none"` | Direct | |
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| `tool_choice.type=tool` | `tool_choice={type:"function",function:{name}}` | Named choice | |
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| `metadata.user_id` | Not mapped | Dropped | No direct equivalent |
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## Content Block Mapping (User Messages)
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| Anthropic Block | OpenAI Equivalent | Notes |
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|---|---|---|
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| `text` | `text` content part | Direct |
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| `image` (base64) | `image_url` with data URI | `data:{media_type};base64,{data}` |
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| `image` (url) | `image_url` with URL | Direct |
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| `document` (base64) | Text note (fallback) | Chat Completions lacks inline PDF support |
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| `tool_result` | `tool` role message | Separate message with `tool_call_id` |
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## Content Block Mapping (Assistant Messages)
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| Anthropic Block | OpenAI Equivalent | Notes |
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| `text` | `content` string | Concatenated if multiple |
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| `tool_use` | `tool_calls[]` entry | `input` (object) -> `arguments` (JSON string) |
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## Response Fields
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| OpenAI Field | Anthropic Field | Mapping Rule |
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|---|---|---|
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| `choices[0].message.content` | `content[].type=text` | Wrap as text block |
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| `choices[0].message.tool_calls` | `content[].type=tool_use` | `arguments` (string) -> `input` (object) |
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| `choices[0].finish_reason=stop` | `stop_reason=end_turn` | |
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| `choices[0].finish_reason=length` | `stop_reason=max_tokens` | |
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| `choices[0].finish_reason=tool_calls` | `stop_reason=tool_use` | |
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| `choices[0].finish_reason=content_filter` | `stop_reason=end_turn` | Approximate |
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| `usage.prompt_tokens` | `usage.input_tokens` | Direct |
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| `usage.completion_tokens` | `usage.output_tokens` | Direct |
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| `usage.total_tokens` | Not mapped | Computed, not stored |
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