feat(providers): add Sakana AI provider with Fugu models

OpenAI-compatible provider at https://api.sakana.ai/v1 (bearer auth).
Registers fugu (fast default) and fugu-ultra (reasoning flagship), both
1M context. BYOK-only, never hosted/auto-billed. Streaming, tool loop,
and response_format supported; attachments mirror deepseek (unsupported
in the current adapter).

Author: waleedlatif1

apps/sim/components/icons.tsx

@@ -3439,6 +3439,16 @@ export const DeepseekIcon = (props: SVGProps<SVGSVGElement>) => (
   </svg>
 )
 
+export const SakanaIcon = (props: SVGProps<SVGSVGElement>) => (
+  <svg {...props} height='1em' viewBox='152 5 38 30' width='1em' xmlns='http://www.w3.org/2000/svg'>
+    <title>Sakana AI</title>
+    <path
+      d='m187.2 7.8-2.5-0.7c-6.3-1.8-12.7-1.2-18 1.5l-10.2 5.7c-1.2 0.7-0.2 2.5 1 1.8l7.6-4.4c0.8 1.7 1.5 4 1.1 7.7-1.4-0.3-6-1.4-10.9 1.5-0.6 0.3-0.8 1.1-0.3 1.7 0.5 0.5 1.2 0.3 1.3 0.2 2.2-1.3 5.6-2.4 9.6-1.4-0.7 2.5-2.5 5.6-6 7.8-1.5 0.7-0.4 2.3 0.7 1.8 1.8-1 5.3-3.4 6.9-9 2.1 0.9 4.2 2.4 5.9 4.6l-7.2 4.1c-1.2 0.6-0.3 2.4 1.1 1.7l9-5c4.6-2.7 8.3-7.5 10.1-13.1l1.3-5.3c0.4-0.4 0-1.1-0.5-1.2zm-11.5 17.5-0.6 0.4c-2-2.6-4.5-4.7-7.5-5.7 0.5-3.8-0.3-6.8-1.2-9.1l1.1-0.6c4.8-2 9.8-2.7 16.2-0.9l1.6 0.4-0.8 2.7c-1.5 4.9-4.5 9.6-8.8 12.8z'
+      fill='#E60000'
+    />
+  </svg>
+)
+
 export function GeminiIcon(props: SVGProps<SVGSVGElement>) {
   const id = useId()
   const gradientId = `gemini_gradient_${id}`

apps/sim/lib/tokenization/constants.ts

@@ -56,6 +56,11 @@ export const TOKENIZATION_CONFIG = {
       confidence: 'medium',
       supportedMethods: ['heuristic', 'fallback'],
     },
+    sakana: {
+      avgCharsPerToken: 4,
+      confidence: 'medium',
+      supportedMethods: ['heuristic', 'fallback'],
+    },
     ollama: {
       avgCharsPerToken: 4,
       confidence: 'low',

apps/sim/providers/attachments.ts

@@ -35,6 +35,7 @@ export type AttachmentProvider =
   | 'xai'
   | 'deepseek'
   | 'cerebras'
+  | 'sakana'
 
 export interface PreparedProviderAttachment {
   file: UserFile
@@ -118,7 +119,7 @@ const BEDROCK_DOCUMENT_FORMATS = new Set([
 const BEDROCK_IMAGE_FORMATS = new Set(['png', 'jpeg', 'jpg', 'gif', 'webp'])
 const BEDROCK_VIDEO_FORMATS = new Set(['mp4', 'mov', 'mkv', 'webm'])
 
-const UNSUPPORTED_FILE_PROVIDERS = new Set<AttachmentProvider>(['deepseek', 'cerebras'])
+const UNSUPPORTED_FILE_PROVIDERS = new Set<AttachmentProvider>(['deepseek', 'cerebras', 'sakana'])
 
 const PROVIDER_SUPPORTED_LABELS: Record<AttachmentProvider, string> = {
   openai: 'images and documents through the Responses API input_image/input_file parts',
@@ -137,6 +138,7 @@ const PROVIDER_SUPPORTED_LABELS: Record<AttachmentProvider, string> = {
   xai: 'images through image_url message parts on Grok vision models',
   deepseek: 'no file attachments in the current API adapter',
   cerebras: 'no file attachments in the current API adapter',
+  sakana: 'no file attachments in the current API adapter',
 }
 
 export function getAttachmentProvider(providerId: ProviderId | string): AttachmentProvider | null {
@@ -156,6 +158,7 @@ export function getAttachmentProvider(providerId: ProviderId | string): Attachme
   if (providerId === 'xai') return 'xai'
   if (providerId === 'deepseek') return 'deepseek'
   if (providerId === 'cerebras') return 'cerebras'
+  if (providerId === 'sakana') return 'sakana'
   return null
 }
 
@@ -303,6 +306,7 @@ function isMimeTypeSupportedByProvider(
       return isImageMimeType(mimeType)
     case 'deepseek':
     case 'cerebras':
+    case 'sakana':
       return false
     default: {
       const _exhaustive: never = provider

apps/sim/providers/models.test.ts

@@ -102,3 +102,35 @@ describe('orderModelIdsByReleaseDate', () => {
     expect([...ordered].sort()).toEqual([...input].sort())
   })
 })
+
+describe('sakana provider definition', () => {
+  const sakana = PROVIDER_DEFINITIONS.sakana
+
+  it('is registered with fugu as the default model', () => {
+    expect(sakana).toBeDefined()
+    expect(sakana.id).toBe('sakana')
+    expect(sakana.defaultModel).toBe('fugu')
+    expect(sakana.modelPatterns).toEqual([/^fugu/])
+  })
+
+  it('exposes fugu and fugu-ultra with a 1M context window', () => {
+    expect(sakana.models.map((m) => m.id)).toEqual(['fugu', 'fugu-ultra'])
+    for (const model of sakana.models) {
+      expect(model.contextWindow).toBe(1000000)
+    }
+  })
+
+  it('prices both models at the documented fugu-ultra ceiling', () => {
+    for (const model of sakana.models) {
+      expect(model.pricing.input).toBe(5)
+      expect(model.pricing.output).toBe(30)
+      expect(model.pricing.cachedInput).toBe(0.5)
+    }
+  })
+
+  it('routes bare fugu model IDs to the sakana provider', () => {
+    const baseModels = getBaseModelProviders()
+    expect(baseModels.fugu).toBe('sakana')
+    expect(baseModels['fugu-ultra']).toBe('sakana')
+  })
+})

apps/sim/providers/models.ts

@@ -23,6 +23,7 @@ import {
   OllamaIcon,
   OpenAIIcon,
   OpenRouterIcon,
+  SakanaIcon,
   TogetherIcon,
   VertexIcon,
   VllmIcon,
@@ -2197,6 +2198,47 @@ export const PROVIDER_DEFINITIONS: Record<string, ProviderDefinition> = {
       },
     ],
   },
+  sakana: {
+    id: 'sakana',
+    name: 'Sakana AI',
+    description: "Sakana AI's Fugu multi-agent models via an OpenAI-compatible API",
+    defaultModel: 'fugu',
+    modelPatterns: [/^fugu/],
+    icon: SakanaIcon,
+    color: '#E60000',
+    capabilities: {
+      temperature: { min: 0, max: 2 },
+      toolUsageControl: true,
+    },
+    models: [
+      {
+        id: 'fugu',
+        pricing: {
+          input: 5,
+          cachedInput: 0.5,
+          output: 30,
+          updatedAt: '2026-06-22',
+        },
+        capabilities: {},
+        contextWindow: 1000000,
+        releaseDate: '2026-06-15',
+        speedOptimized: true,
+      },
+      {
+        id: 'fugu-ultra',
+        pricing: {
+          input: 5,
+          cachedInput: 0.5,
+          output: 30,
+          updatedAt: '2026-06-22',
+        },
+        capabilities: {},
+        contextWindow: 1000000,
+        releaseDate: '2026-06-15',
+        recommended: true,
+      },
+    ],
+  },
   mistral: {
     id: 'mistral',
     name: 'Mistral AI',

apps/sim/providers/registry.ts

@@ -16,6 +16,7 @@ import { ollamaProvider } from '@/providers/ollama'
 import { ollamaCloudProvider } from '@/providers/ollama-cloud'
 import { openaiProvider } from '@/providers/openai'
 import { openRouterProvider } from '@/providers/openrouter'
+import { sakanaProvider } from '@/providers/sakana'
 import { togetherProvider } from '@/providers/together'
 import type { ProviderConfig, ProviderId } from '@/providers/types'
 import { vertexProvider } from '@/providers/vertex'
@@ -34,6 +35,7 @@ const providerRegistry: Record<ProviderId, ProviderConfig> = {
   xai: xAIProvider,
   cerebras: cerebrasProvider,
   groq: groqProvider,
+  sakana: sakanaProvider,
   vllm: vllmProvider,
   litellm: litellmProvider,
   mistral: mistralProvider,