AgentsAutonomy & tool use
Spline V2 and a new ChatGPT plugin let AI agents build editable 3D scenes through MCP
Spline V2 rebuilt its browser 3D editor so AI agents, including ChatGPT through MCP, can create and edit live interactive scenes. A promotional video shows ChatGPT planning two games, but its claim that MCP requires the desktop app is now outdated.
From the r/AISEOInsider (via last30days) article of October 26, 2026 and cited sources: Spline V2 launched on August 20, 2026, as a rebuilt 3D editor with a built-in agent. [4] [2] [9]
SOURCES[4] Spline Blog – Introducing Spline V2 blog.spline.design[2] Linked video: Spline AI 3D + ChatGPT Built Two 3D Games… youtube.com[9] CreateWith – Spline V2 rebuilds the editor around AI agents createwith.com
AT Pulse research deskPublished · Updated · 5 min read · AI-assisted analysisAI-assisted, not human-edited. Methodology Corrections Who owns this site
- What happened
- Spline V2 launched on August 20, 2026, as a rebuilt 3D editor with a built-in agent. [4] [2] [9]
- Original source
- r/AISEOInsider (via last30days) article, independent perspective
- Brief by
- AT Pulse research desk AI-assisted; publisher and contact on the desk page
- When
- October 26, 2026 article published
- Covered
- Oct 26 edition
- Evidence
- 9 sources across 7 sites
- 1Spline AI 3D + ChatGPT Built Two 3D Games While I Watchedreddit.com
- 2Linked video: Spline AI 3D + ChatGPT Built Two 3D Games…youtube.com
- 3Introducing Spline for ChatGPTblog.spline.design
- 4Spline Blog – Introducing Spline V2blog.spline.design
- 5AlternativeTo – Spline V2 launchesalternativeto.net
- 6CreateWith – Spline Hana V2 adds MCPcreatewith.com
RisingHow it’s measured
YouTube video · 1.7K views · 20 likes
Reach blends public engagement (views, likes, comments, shares, stars) from the platforms where the story or its original source lives: YouTube, Hacker News, GitHub, Substack and similar. A video and the article written from its transcript share one score, taken from the video. Platforms with no data are left out rather than counted as zero, and the age of a story never lowers its score.
Spline V2 launched on August 20, 2026, as a rebuilt 3D editor with a built-in agent. The agent uses the editor's own tools on objects, materials, lights, cameras, particles, events and states. It also writes HTML/JS linked to the scene. The result is a scene that can still be edited, not a flat image or a static mesh. [4] [2] [9]
Spline's MCP server gives outside clients such as ChatGPT, Claude, Cursor, Codex and VS Code the same tools as Spline's own agent. A hosted server and a ChatGPT plugin launched on October 21 now work without the desktop app and on the Free plan. That makes the linked video's claim that MCP only works on the desktop out of date. [3] [7] [2]
Documented: outside agents get the same editing tools as Spline's own agent, and the ChatGPT plugin runs on the Free plan without installs.
Read the full assessment
Implication: teams can cheaply prototype interactive web 3D, but output quality and playability remain unmeasured, so treat results as drafts.
Source checks are done; writing the dossier now.
Executive brief
The video's main setup advice is out of date. It says ChatGPT can drive Spline only through the desktop app (00:02:18). But Spline launched a cloud-hosted ChatGPT plugin on October 21, 2026, and it needs nothing open on the user's computer (Introducing Spline for ChatGPT). The rest of the story checks out. Spline V2 (August 20, 2026) rebuilt the browser 3D editor so AI agents can edit live, editable scenes rather than produce flat images. The "two 3D games" are only partly shown: the video shows ChatGPT planning them, not finished, playable results.
What changed and event timeline
Spline V2 ships
Spline calls it a full rebuild of its 3D editor. The release adds a built-in agent, an MCP server, a WebGPU renderer and new materials and modeling tools ().
First third-party write-ups
AlternativeTo reports the release, including MCP control from ChatGPT, Claude Code, Cursor and VS Code through the new desktop app ().
Hana V2 gets MCP
Spline's 2D/UI canvas, Hana, also opens to outside agents. It adds GLB/GLTF imports and makes WebGPU the default ().
Spline for ChatGPT launches
The plugin connects to Spline's hosted MCP server and runs a cloud editor beside the chat. It works on every plan, including Free, and also in Codex ().
Promotional video and post
An AI avatar of Julian Goldie demos ChatGPT planning a racing game and a puzzle game in Spline (;).
Capabilities and access
- Product: Spline V2. The captions' "Spline 5.2" (00:00:46) is most likely a captioning error. The underlying LLM behind Spline's own agent is not disclosed.
- Built-in agent: works with objects, materials, lights, cameras, booleans, particles, cloners, events and states, and writes HTML/JS linked to the scene (Spline Blog).
- Two ways to connect over MCP (Spline MCP docs):
Read the full section
- Product: Spline V2. The captions' "Spline 5.2" (00:00:46) is most likely a captioning error. The underlying LLM behind Spline's own agent is not disclosed.
- Built-in agent: works with objects, materials, lights, cameras, booleans, particles, cloners, events and states, and writes HTML/JS linked to the scene (Spline Blog).
- Two ways to connect over MCP (Spline MCP docs):
- Hosted:
mcp.spline.design/mcp, signed in with OAuth. Works with ChatGPT, Claude, Cursor, Codex and VS Code. - Desktop: runs locally on macOS/Windows. Works with Claude Code, Claude Desktop, Cursor, VS Code, Antigravity, ChatGPT and Windsurf.
- Limits: a daily allowance and per-minute caps, both set by plan.
Technical analysis for researchers and developers
- Shared tools: outside clients get the same tool surface as Spline's own agent.
- Self-checking: the agent takes screenshots to check its own work.
- State across turns: each ChatGPT conversation maps to one cloud editor, and follow-up messages edit the same file (Spline for ChatGPT).
Read the full section
- Shared tools: outside clients get the same tool surface as Spline's own agent. That covers creating files, inspecting objects, editing code layers, generating models and images, analysing performance, publishing and managing versions (MCP docs).
- Self-checking: the agent takes screenshots to check its own work. It can also place objects with a constraint solver using relations such as "on top of" or "facing" (video 04:00).
- State across turns: each ChatGPT conversation maps to one cloud editor, and follow-up messages edit the same file (Spline for ChatGPT).
- Rendering: WebGPU is now the default, with WebGL as a fallback (Spline Blog).
- Security: the desktop server listens on localhost only and allowlists origins. With the hosted server, data goes to Spline's cloud (MCP docs).
- Evaluation: Spline has published no benchmark of how well agents build scenes.
Claims and evidence
- Booleans about 4× faster, smaller exports: these figures come from Spline itself (Spline Blog), and the video repeats them (06:09).
- "Built two 3D games": the video shows ChatGPT's plans and in-progress steps, such as "planning the racetrack" and "designing the puzzle gameplay" (04:09–04:49).
- MCP only works in the desktop app (02:18): this was true of the desktop server at launch.
Read the full section
- Booleans about 4× faster, smaller exports: these figures come from Spline itself (Spline Blog), and the video repeats them (06:09). No independent benchmark has been found.
- "Built two 3D games": the video shows ChatGPT's plans and in-progress steps, such as "planning the racetrack" and "designing the puzzle gameplay" (04:09–04:49). It never shows a finished game being played.
- MCP only works in the desktop app (02:18): this was true of the desktop server at launch. Spline's current docs and the October 21 plugin describe a hosted option, which contradicts the claim.
- Coverage: the third-party reports reviewed (AlternativeTo, CreateWith) restate Spline's announcements. None is a hands-on test.
Context and prior work
- MCP has become the standard way for tools to expose themselves to agents.
- Before Spline shipped its official server, a community MCP server for Spline already existed (GitHub: lesleslie/spline-mcp).
- The pitch that the agent produces an editable scene rather than a flattened image or static mesh sets Spline apart from text-to-3D generators (CreateWith).
Read the full section
- MCP has become the standard way for tools to expose themselves to agents. Spline hooks into ChatGPT, Codex, Claude and Cursor rather than building its own chat front end.
- Before Spline shipped its official server, a community MCP server for Spline already existed (GitHub: lesleslie/spline-mcp).
- The pitch that the agent produces an editable scene rather than a flattened image or static mesh sets Spline apart from text-to-3D generators (CreateWith).
Limitations, safety and contested findings
- Hosted server can't reach local files. Hana round-trips only support a subset of HTML+CSS (MCP docs).
- Every ChatGPT action uses up plan quota (Spline for ChatGPT).
- Privacy depends on the mode. The video's line that data "stays between" the app and the client (02:44) applies only to desktop mode.
Read the full section
- Hosted server can't reach local files. File uploads need the desktop app. Hana round-trips only support a subset of HTML+CSS (MCP docs).
- Every ChatGPT action uses up plan quota (Spline for ChatGPT).
- Privacy depends on the mode. The video's line that data "stays between" the app and the client (02:44) applies only to desktop mode.
- The source is selling something. The video promotes a paid community at 02:52 and again at 07:44.
Business and practitioner implications
- The ChatGPT plugin works on the Free plan with no install, so marketing teams can prototype interactive web 3D such as configurators and product scenes.
- Use the desktop MCP server for local files and data that should stay on the machine. Use the hosted server for quick, setup-free work.
- Tool-call caps are per plan.
Read the full section
- Cheap to try. The ChatGPT plugin works on the Free plan with no install, so marketing teams can prototype interactive web 3D such as configurators and product scenes.
- Choose the mode by data sensitivity. Use the desktop MCP server for local files and data that should stay on the machine. Use the hosted server for quick, setup-free work.
- Budget for retries. Tool-call caps are per plan.
- Treat agent output as a draft. No independent evaluation exists, so playability, performance and scene quality need human review, which the video itself advises (07:18).
The source trail.
Sources (9)
Spline AI 3D + ChatGPT Built Two 3D Games While I Watched
Feed excerpt only. A transcript of the video linked from this page is supplied (linked video auto captions; https://www.youtube.com/watch?v=ISqByUA--DY); automatic text may contain errors.
reddit.comLinked video: Spline AI 3D + ChatGPT Built Two 3D Games While I Watched
linked video auto captions
www.youtube.com