Slipstream
Free racing game · plays in your browser · made with GPT-6 Astra
Play Slipstream free in your browser: a racing game with nothing to download and no sign-up. Its creator files it under Traffic. It was written by GPT-6 Astra, and the prompt behind it is printed further down this page. It works on a phone as well as a desktop.
About Slipstream
Version 3.2.0 adds selectable Night + Rain conditions to Journey, Endless and Rival. Switch conditions in the lobby. Drive past illuminated buildings and streetlight reflections into dark countryside, use high beams for extra reach, and watch automatic wipers clear droplets from the windshield. Traffic throws up light tire spray. Wet roads extend stopping distances and reduce lateral grip; a grip warning helps you ease off and straighten the car. Rival stores separate dry and wet personal-best ghosts. The existing audio mix is unchanged.
Slipstream is a first-person 3D traffic racer with recoverable mistakes, clean driving chains, and a personal-best ghost.
Light scrapes now damage and jolt the car, cost speed, and break your chain instead of immediately ending the drive. Settle the car and recover; heavy impacts and a totaled car still end the run. Clean overtakes score after a safe exit, tighter gaps and smooth lines earn more, and consecutive passes grow the reward. Controlled emergency braking earns skill points once per vehicle. Contact cancels pending bonuses and resets unfinished clean-distance contracts.
Three modes: Journey, Endless, and Rival. Rival is a fixed 3 km time trial with repeatable traffic. Complete a first run to record your ghost, then chase that translucent car with a live time delta. Faster completed runs replace your best; records are separate for each car and upgrade setup. Rival traffic holds its lanes for a repeatable challenge; your ghost cannot collide. Personal bests and upgrades save locally in this browser.
The 9 km Dusk Journey crosses seven connected sections with sweeping bends, crests, a lit tunnel with engine echoes, a viaduct, a construction lane closure, and joining traffic. At three exits, bank your bonus or continue to raise its multiplier, up to 2.5x. A crash or early retirement loses the at-risk bonus while keeping base earnings. Finishing banks everything. Endless keeps the highway going.
WASD or arrows accelerate, b
How was Slipstream made?
The prompt behind Slipstream
Build a single-player cockpit highway racer with a compact starter car, speed-sensitive steering, tire grip and sprung chassis pitch/roll, distinct handling for three cars, an unobstructed steering wheel, a sculpted dashboard and rounded car bodywork, automatic gears with RPM-driven layered engine audio, directional traffic sound and quiet wind, live twin instruments, a sloped tinted windscreen and live rear-view and left exterior mirrors. Add a 9 km dusk journey with seven connected sections, curved and hilly road geometry, a lit tunnel with engine echoes, a viaduct, construction lane closure and joining traffic. Include different driver behaviors, signaled safe merges, three banking exits with growing at-risk bonus multipliers, driving contracts, immediate horn and held high beams, recoverable scrapes and accumulated damage, delayed clean-overtake scoring with tight-gap and smooth-exit rewards, clean chains and controlled braking saves, boost, Journey and Endless plus a third Rival mode with fixed 3 km traffic and a saved personal-best ghost per car and upgrade setup, live ghost delta, saved garage upgrades, keyboard and touch controls, a rotating showroom and an original lobby soundtrack. Include selectable Night + Rain conditions in all three modes, extended high-beam reach, illuminated roadside buildings, wet streetlight pools, windshield droplets cleared by automatic wipers, traffic spray, longer wet braking distances, progressive lateral grip limits and a grip warning. Separate dry and wet Rival records while retaining the existing audio mix. Keep procedural trees stable by road position, cache scenery between road chunks, and optimize traffic geometry and active scenery instance counts. Usage checkpoint 2026-10-13T12:37:23.390Z: 41,906,518 recorded tokens across this game conversation, including earlier updates and publishing. The $72.09 field is the requested HYPOTHETICAL GPT-6 Astra standard API equivalent, not an actual charge. Recorded models: gpt-6-astra, gpt-6.1-sol. This scenario prices all tokens at $10/M uncached input, $1/M cached input, $12.50/M cache writes and $50/M output. Reasoning is included in output. Separate artwork/tool charges and reporting after this checkpoint are excluded. Rates: https://developers.openai.com/api/docs/models/gpt-6-astra .
Categories and tags
Questions about Slipstream
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- Is Slipstream free to play?
- Yes. Slipstream is free, runs in your browser, and needs no account. Nothing to download, no plugin, no sign-up — open the page and play.
- Do I need to download or install Slipstream?
- No. Slipstream runs entirely in the browser on desktop and on a phone. There is nothing to install and no launcher to sign in to.
- Which AI model made Slipstream?
- Slipstream was written by GPT-6 Astra, a model from OpenAI, using Codex, JavaScript, Three.js, Node.js simulation tests, ImageGen artwork. The prompt that produced it is published on this page, so you can see exactly what it was asked for.
- What is Slipstream like?
- It is a racing game, filed by its creator under Traffic and First Person and Upgrades and Single Player. Version 3.2.0 adds selectable Night + Rain conditions to Journey, Endless and Rival.
- Does Slipstream keep a high score?
- Yes. Any score Slipstream reports goes to the leaderboard under the game, and you do not need an account for it to count.
- How much did Slipstream cost to make?
- $72.09 in model usage, running GPT-6 Astra, over about 24 minutes of building. Every game here records what it cost, which is the point of the site.
Version 3.2.0 · updated 2026-10-13