Summer API # Every game asset, one API. Create everything you need for your game with one API: 3D, images, video, voice, sound and music. Your code and your agents get the models behind Summer, the game engine built for AI. One sign-in, one credit balance, files ready for your game. [Get started](https://www.summerengine.com/studio/developers) [Browse models](https://www.summerengine.com/models) No markup on assets. Every model at the provider's list price. [Read the API docs](https://docs.summerengine.com/api) ## Give it to your agent. Paste one line into your coding agent. It signs in with Summer, you approve it and pick its spend limit, and it makes what your game needs. No key to copy or leak. Paste into your agent ``` Make the assets for my game with the Summer API. Run `npx -y summer-engine@latest login` and ask me to approve, then read https://docs.summerengine.com/llms.txt and make what the game needs. ``` Copy Or sign in yourself ``` npx -y summer-engine@latest login ``` Copy ## One call, one 3D model. Sign in once with summer login, then run it. The answer is the finished job, with a link to the GLB in your Summer assets. Every model page has the same call for that model. [Quickstart in curl, TypeScript and Python](https://docs.summerengine.com/api/quickstart) CLI ``` summer api run 3d/default --input '{"prompt": "a treasure chest, game prop"}' --wait ``` Copy curl ``` curl https://www.summerengine.com/v1/jobs \ -H "Authorization: Bearer $(summer token)" \ -H "Idempotency-Key: $(uuidgen)" \ -H "Prefer: wait=60" \ -H "Content-Type: application/json" \ -d '{"model": "3d/default", "input": {"prompt": "a treasure chest, game prop"}}' ``` Copy ## Put together for your game. That is the point: every model in one place, tested for games, so one agent can run a whole pipeline. A character from a concept to an animated mesh, a cutscene with its sound, a talking character, a trailer. * ### A playable character From one concept to a rigged, animated 3D character in your scene. 1. [1 . Image Nano Banana 2 Lite Concept and turnaround](https://www.summerengine.com/models/nano-banana-2-lite) 2. [2 . Image to 3D Hunyuan 3D 3.1 Pro Textured 3D model](https://www.summerengine.com/models/hunyuan-3d-3-1-pro) 3. [3 . Motion Meshy animation library Idle, walk and run](https://www.summerengine.com/models/meshy-animation-library) * ### A cutscene A key frame of your own art, brought to life, with its sound and score. 1. [1 . Image Nano Banana 2 Lite Key frame in your art style](https://www.summerengine.com/models/nano-banana-2-lite) 2. [2 . Image to video Kling 3.0 The shot, on model](https://www.summerengine.com/models/kling-3-0) 3. [3 . Video to audio Kling Video to Audio Sound that follows the picture](https://www.summerengine.com/models/kling-video-to-audio) 4. [4 . Music Eleven Music v2 The score under it](https://www.summerengine.com/models/music-v2) * ### A talking character A portrait that speaks its lines in its own voice. 1. [1 . Image Nano Banana 2 Lite Portrait](https://www.summerengine.com/models/nano-banana-2-lite) 2. [2 . Text to speech Eleven v3 Voice lines](https://www.summerengine.com/models/expressive-v3) 3. [3 . Image to video Kling 3.0 The portrait speaking](https://www.summerengine.com/models/kling-3-0) * ### A set of props A matching prop sheet, then each prop as a game-ready mesh. 1. [1 . Image Nano Banana 2 Lite Prop sheet in one style](https://www.summerengine.com/models/nano-banana-2-lite) 2. [2 . Image editing Nano Banana 2 Lite One prop per picture](https://www.summerengine.com/models/nano-banana-2-lite) 3. [3 . Image to 3D Hunyuan 3D 3.1 Pro A mesh for each](https://www.summerengine.com/models/hunyuan-3d-3-1-pro) ## Every model, at list price. No markup on assets. Every model at the provider's list price. 103 curated models, tested for games, each with its price on its page. Call one by its id, or use the default for its kind. * [Images 14](https://www.summerengine.com/models) * [3D models 16](https://www.summerengine.com/models) * [Video 40](https://www.summerengine.com/models) * [Voice 19](https://www.summerengine.com/models) * [Dialogue 1](https://www.summerengine.com/models) * [Sound effects 4](https://www.summerengine.com/models) * [Music 6](https://www.summerengine.com/models) * [Animation 3](https://www.summerengine.com/models) * ### One sign-in, every model One REST API for every capability, with the same job shape for all of them. Short jobs come back done; long ones you wait for, follow or get a webhook for. * ### Files ready for your game Summer picks tested defaults, sizes 3D models for games, and saves every file to your Summer assets with a stable link. * ### Pay per call Usage is paid from your Summer credits, at the provider's list price. Give each app its own spend limit. No plan needed. ## Where to next. * [Get started Sign in, connect your agent, see your apps, usage and spend in Studio > Developers.](https://www.summerengine.com/studio/developers) * [Browse the models 103 models with real outputs, prices, inputs and the code to call each one.](https://www.summerengine.com/models) * [Read the docs Quickstart in curl, TypeScript and Python, jobs, webhooks, errors and the OpenAPI file.](https://docs.summerengine.com/api) ## Good to know What does a call cost? No markup on assets. Every model at the provider's list price. Every model page shows its price, GET /v1/models lists them all, and POST /v1/estimate gives the exact price of one request before you run it. Usage is paid from your Summer credits; no plan is needed. How do I keep an agent from spending too much? Give every connected app its own spend limit when you approve it ($5 is a good start), reset each day, week or month. See what each one spent, and revoke it at once, in Studio under Developers. Are there rate limits? No rate limits on paid usage. Big batches queue and run in order: send up to 500 jobs in one call, and each account runs 10 at once, rising to 40 as you buy more credits. Your credits and each app's own limit are the only limits. Which agents work with it? Any agent that can run a command or make an HTTP call: Claude Code, Codex, Cursor, Gemini CLI and the rest. The Summer CLI signs them in, and the docs have an llms.txt written for agents. Where do the files go? Every finished file is saved to your Summer assets, private unless you ask for public, with a stable link. The same file opens in Summer Engine. Source: https://www.summerengine.com/summer-api --- ## Machine-readable resources - Site index for agents: https://www.summerengine.com/llms.txt - Full inlined content: https://www.summerengine.com/llms-full.txt - Porting catalog: https://www.summerengine.com/llms-porting.txt - Structured catalog: https://www.summerengine.com/agent-catalog.json - Sitemap: https://www.summerengine.com/sitemap.xml - Developer resources: https://www.summerengine.com/docs - Summer API (assets from any agent or code; public per-call model prices): https://docs.summerengine.com/api