{
	"model_id": "particle/particle-1",
	"provider_id": "particle",
	"name": "Particle-1",
	"description": "Particle-1 is Particle AI's reasoning model for chat, agentic coding, and tool use. It accepts text and images, with a 1,048,576-token context window, streaming responses, and configurable reasoning effort.",
	"task": "Text Generation",
	"tags": [
		"LLM",
		"Coding",
		"Reasoning",
		"Function Calling",
		"Vision"
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	"max_output_tokens": 131072,
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		"Output tokens (per 1M)": 1
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	"examples": [
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			"name": "Chat completion",
			"description": "Explain KV caching with reasoning disabled for a concise response.",
			"input": {
				"messages": [
					{
						"role": "user",
						"content": "Explain KV caching in two sentences."
					}
				],
				"reasoning_effort": "none",
				"max_completion_tokens": 256
			},
			"output": {
				"text": "KV caching stores the key and value tensors computed for each token during transformer attention so they can be reused instead of recomputed at every decoding step. This turns generation from quadratic to roughly linear work per new token, dramatically speeding up autoregressive inference at the cost of extra memory."
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							"role": "assistant",
							"content": "KV caching stores the key and value tensors computed for each token during transformer attention so they can be reused instead of recomputed at every decoding step. This turns generation from quadratic to roughly linear work per new token, dramatically speeding up autoregressive inference at the cost of extra memory.",
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					"completion_tokens": 57,
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				"service_tier": "free"
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			"code_snippets": [
				{
					"label": "typescript",
					"language": "typescript",
					"code": "const response = await env.AI.run(\n  'particle/particle-1',\n  {\n    messages: [{ role: 'user', content: 'Explain KV caching in two sentences.' }],\n    reasoning_effort: 'none',\n    max_completion_tokens: 256,\n  },\n)\nconsole.log(response)"
				},
				{
					"label": "curl",
					"language": "bash",
					"code": "curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/v1/chat/completions \\\n  --header \"Authorization: Bearer $CLOUDFLARE_API_TOKEN\" \\\n  --header \"Content-Type: application/json\" \\\n  --data '{\n  \"model\": \"particle/particle-1\",\n  \"messages\": [\n    {\n      \"role\": \"user\",\n      \"content\": \"Explain KV caching in two sentences.\"\n    }\n  ],\n  \"reasoning_effort\": \"none\",\n  \"max_completion_tokens\": 256\n}'"
				}
			]
		},
		{
			"name": "Streaming chat",
			"description": "Stream a short explanation of exponential backoff.",
			"input": {
				"messages": [
					{
						"role": "user",
						"content": "Explain exponential backoff in two sentences."
					}
				],
				"reasoning_effort": "none",
				"max_completion_tokens": 256,
				"stream": true
			},
			"output": {
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					"Ex",
					"ponential backoff is a strategy",
					" where a",
					" system",
					" retries a",
					" failed operation after",
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					" a",
					" struggling",
					" service by",
					" spreading out",
					" retries over",
					" time."
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					"created": 1793303113,
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					"id": "819751464b54400dadedfd50c69e91ca",
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					"label": "typescript",
					"language": "typescript",
					"code": "const response = await env.AI.run(\n  'particle/particle-1',\n  {\n    messages: [{ role: 'user', content: 'Explain exponential backoff in two sentences.' }],\n    reasoning_effort: 'none',\n    max_completion_tokens: 256,\n    stream: true,\n  },\n)\nconsole.log(response)"
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				{
					"label": "curl",
					"language": "bash",
					"code": "curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/v1/chat/completions \\\n  --header \"Authorization: Bearer $CLOUDFLARE_API_TOKEN\" \\\n  --header \"Content-Type: application/json\" \\\n  --data '{\n  \"model\": \"particle/particle-1\",\n  \"messages\": [\n    {\n      \"role\": \"user\",\n      \"content\": \"Explain exponential backoff in two sentences.\"\n    }\n  ],\n  \"reasoning_effort\": \"none\",\n  \"max_completion_tokens\": 256,\n  \"stream\": true\n}'"
				}
			]
		},
		{
			"name": "Tool calling",
			"description": "Ask Particle-1 to call a weather lookup function.",
			"input": {
				"messages": [
					{
						"role": "user",
						"content": "What is the weather in Paris?"
					}
				],
				"reasoning_effort": "none",
				"max_completion_tokens": 256,
				"tools": [
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						"type": "function",
						"function": {
							"name": "get_weather",
							"description": "Get the current weather for a city.",
							"parameters": {
								"type": "object",
								"properties": {
									"city": {
										"type": "string"
									}
								},
								"required": [
									"city"
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							}
						}
					}
				],
				"tool_choice": {
					"type": "function",
					"function": {
						"name": "get_weather"
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				}
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			"output": {
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					{
						"id": "call_b6bcda29bef84dcf80a570a1",
						"type": "function",
						"function": {
							"name": "get_weather",
							"arguments": "{\"city\": \"Paris\"}"
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					"code": "const response = await env.AI.run(\n  'particle/particle-1',\n  {\n    messages: [{ role: 'user', content: 'What is the weather in Paris?' }],\n    reasoning_effort: 'none',\n    max_completion_tokens: 256,\n    tools: [\n      {\n        type: 'function',\n        function: {\n          name: 'get_weather',\n          description: 'Get the current weather for a city.',\n          parameters: {\n            type: 'object',\n            properties: { city: { type: 'string' } },\n            required: ['city'],\n          },\n        },\n      },\n    ],\n    tool_choice: { type: 'function', function: { name: 'get_weather' } },\n  },\n)\nconsole.log(response)"
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	"cover_image_url": "https://pub-26f1392c1b674324be6786695bd72257.r2.dev/particle/particle-1.png",
	"metadata": {
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		"Reasoning": "Yes",
		"Vision": "Yes"
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	"created_at": "2026-10-30 17:20:28",
	"schema": {
		"input": {
			"$schema": "https://json-schema.org/draft/2020-12/schema",
			"type": "object",
			"properties": {
				"messages": {
					"type": "array",
					"items": {
						"type": "object",
						"properties": {
							"role": {
								"type": "string",
								"enum": [
									"system",
									"developer",
									"user",
									"assistant",
									"tool"
								]
							},
							"content": {
								"anyOf": [
									{
										"type": "string"
									},
									{
										"type": "null"
									},
									{
										"type": "array",
										"items": {}
									}
								]
							}
						},
						"required": [
							"role"
						],
						"additionalProperties": {}
					}
				},
				"temperature": {
					"type": "number",
					"minimum": 0,
					"maximum": 2
				},
				"max_tokens": {
					"type": "number",
					"exclusiveMinimum": 0
				},
				"max_completion_tokens": {
					"type": "number",
					"exclusiveMinimum": 0
				},
				"top_p": {
					"type": "number",
					"minimum": 0,
					"maximum": 1
				},
				"frequency_penalty": {
					"type": "number",
					"minimum": -2,
					"maximum": 2
				},
				"presence_penalty": {
					"type": "number",
					"minimum": -2,
					"maximum": 2
				},
				"stream": {
					"type": "boolean"
				},
				"stream_options": {
					"type": "object",
					"properties": {
						"include_usage": {
							"type": "boolean"
						}
					},
					"additionalProperties": false
				},
				"tools": {
					"type": "array",
					"items": {}
				},
				"tool_choice": {},
				"response_format": {},
				"modalities": {
					"type": "array",
					"items": {
						"type": "string",
						"enum": [
							"text",
							"audio"
						]
					}
				},
				"audio": {
					"type": "object",
					"properties": {
						"voice": {
							"type": "string",
							"enum": [
								"alloy",
								"ash",
								"ballad",
								"coral",
								"echo",
								"sage",
								"shimmer",
								"verse"
							]
						},
						"format": {
							"type": "string",
							"enum": [
								"wav",
								"mp3",
								"flac",
								"opus",
								"pcm16"
							]
						}
					},
					"additionalProperties": false
				},
				"reasoning_effort": {
					"description": "Optional reasoning control; availability and accepted values are model-dependent.",
					"type": [
						"string",
						"null"
					]
				}
			},
			"required": [
				"messages"
			],
			"additionalProperties": {}
		},
		"output": {
			"$schema": "https://json-schema.org/draft/2020-12/schema",
			"type": "object",
			"properties": {
				"id": {
					"type": "string"
				},
				"object": {
					"type": "string"
				},
				"created": {
					"type": "number"
				},
				"model": {
					"type": "string"
				},
				"choices": {
					"type": "array",
					"items": {
						"type": "object",
						"properties": {
							"index": {
								"type": "number"
							},
							"message": {
								"type": "object",
								"properties": {
									"role": {
										"type": "string"
									},
									"content": {
										"type": [
											"string",
											"null"
										]
									},
									"tool_calls": {
										"anyOf": [
											{
												"type": "array",
												"items": {}
											},
											{
												"type": "null"
											}
										]
									},
									"audio": {
										"anyOf": [
											{
												"type": "object",
												"properties": {
													"id": {
														"type": "string"
													},
													"data": {
														"type": "string"
													},
													"expires_at": {
														"type": "number"
													},
													"transcript": {
														"type": "string"
													}
												},
												"additionalProperties": {}
											},
											{
												"type": "null"
											}
										]
									}
								},
								"required": [
									"role"
								],
								"additionalProperties": {}
							},
							"finish_reason": {
								"type": [
									"string",
									"null"
								]
							}
						},
						"required": [
							"index",
							"message",
							"finish_reason"
						],
						"additionalProperties": {}
					}
				},
				"usage": {
					"type": "object",
					"properties": {
						"prompt_tokens": {
							"type": "number"
						},
						"completion_tokens": {
							"type": "number"
						},
						"total_tokens": {
							"type": "number"
						}
					},
					"required": [
						"prompt_tokens",
						"completion_tokens",
						"total_tokens"
					],
					"additionalProperties": {}
				}
			},
			"required": [
				"id",
				"object",
				"created",
				"model",
				"choices"
			],
			"additionalProperties": {}
		}
	}
}