One of these is already gone
Google retired Gemini CLI into Antigravity CLI, and consumer access stopped serving requests on 18 June 2026. We keep the row because knowing what replaced it is more useful than a page that quietly drops it.
Coding harnesses
You pick a model for capability and a harness for how the work gets done. These are the harnesses worth knowing in 2026, with every claim sourced and dated — including the one that has already been retired.
Read this first
A harness is the client that turns a model into an agent: it holds the loop, the tools, the file access and the permissions. Two people using the same model through different harnesses get very different results — and pay very different amounts, because the harness decides how many tokens the job costs.
Google retired Gemini CLI into Antigravity CLI, and consumer access stopped serving requests on 18 June 2026. We keep the row because knowing what replaced it is more useful than a page that quietly drops it.
When Z.ai published GLM-5.3's scores, it ran them inside Claude Code — a competitor's harness. That tells you the harness layer has become standard infrastructure, and that a model's published score is partly a statement about the client it was measured in.
Filter by how each one handles models, then select a row for its full detail, limitations and sources. Retired harnesses are hidden by default.
| Harness | Models | Licence | Runs on | Pricing |
|---|---|---|---|---|
| Anthropic | Locked to one vendorAnthropic models only (Claude Fable, Opus, Sonnet, Haiku) | Proprietary | Terminal, VS Code, JetBrains, Desktop, Web, GitHub, Slack | Included with Claude paid plans; also usage-billed via the Anthropic API |
| SST | Any modelAny provider via BYOK — Anthropic, OpenAI, Google, DeepSeek, GLM, local models | Open source | Terminal, IDE extensions, Web | Free and open-source with your own API keys; OpenCode Go plan $5 first month, then $10/month |
| Z.ai | Own model, not lockedGLM family (GLM-5.3, GLM-5.2), including a self-hosted GLM endpoint | Proprietary | Desktop (macOS, Windows, Linux), Mobile steering via WeChat / Feishu | Via the GLM Coding Plan's points quota — off-peak calls cost 50% of standard points |
| Langbase | Any modelAnthropic, OpenAI, Google, DeepSeek, Qwen, Kimi, GLM, MiniMax and more — BYOK with no markup | Proprietary | Terminal | From $1/month with $10 credits, up to $200/month Ultra; Teams $40/month; BYOK carries no markup |
| DeepSeek | Own model, not lockedBuilt around DeepSeek models (V4 Flash, V4 Pro); plugin architecture allows others | Open source | Terminal, Web UI | MIT-licensed and free; you pay only for model tokens |
| Own model, not lockedGemini models | Proprietary | Desktop, CLI, SDK | Via Google AI Pro / Ultra and Gemini Code Assist licences |
Extension points
The honest limitation
Model-locked. You cannot point it at a cheaper open-weights model when a task does not need a frontier one.
Best for
Teams already on Anthropic models who want the most tuned, best-integrated experience.
Source Verified 2026-08-14
Pick the model that clears your quality bar at the lowest cost, then pick the harness that runs it the way your team works. Doing it the other way round is how people end up locked into a vendor they did not mean to choose.
What shipped recently
Dated releases from every major lab, with each vendor's own claims labelled as claims.
OpenIndependent scores
Third-party benchmark results — deliberately separate from whatever a lab publishes about itself.
OpenWhat to actually build
A deployment plan picks the stack for one workflow at your budget, models and tooling included.
OpenWe record a source and a check date for every claim on this page, and we show disagreements instead of resolving them silently. How we verify