# Gemini Spark vs Leon (slim)

> Leon scores 41 (E) to Gemini Spark's 24.5 (F) for assistant proactive. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/gemini-spark-vs-leon.md (~2,600 tokens) · this version ~630 tokens · JSON https://www.anchorterminal.com/compare/gemini-spark-vs-leon.json · canonical https://www.anchorterminal.com/compare/gemini-spark-vs-leon
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-12

Leon scores 41 (E) on agent readiness against Gemini Spark's 24.5 (F), and leads in 5 of 7 scored categories. Gemini Spark leads on security & auth. Both do assistant proactive.

- Gemini Spark: F 24.5, rank #974 of 986 · https://www.anchorterminal.com/tools/gemini-spark.min.md
- Leon: E 41, rank #934 of 986 · https://www.anchorterminal.com/tools/leon.min.md
- Gemini Spark, good for A person who already keeps mail, calendar and files in a personal Google Account and accepts Keep Activity being on. Ahead on Security & auth, 60 against 34.
- Leon, good for A developer who wants a self-hosted assistant with memory, computer use and a local model, and who will read the source. Ahead on Reliability, 32 against 14; Schema & documentation, 33 against 17; Agent ergonomics, 57 against 9; Payments & pricing, 60 against 10; Transparency & trust, 60 against 49. Also No key needed to call it; Free to start without a card; Open source.

| Category | Gemini Spark | Leon |
| --- | --- | --- |
| Reliability (16%) | 14 | 32 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 17 | 33 |
| Agent ergonomics (13%) | 9 | 57 |
| Security & auth (14%) | 60 | 34 |
| Payments & pricing (10%) | 10 | 60 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 17 | 15 |
| Transparency & trust (7%) | 49 | 60 |

| Fact (where they differ) | Gemini Spark | Leon |
| --- | --- | --- |
| Kind | Platform | Agent harness |
| Vendor | Google LLC | Louis Grenard (Leon AI) |
| Auth | OAuth | None |
| Pricing | Paid | Free |
| Licence | Proprietary hosted service under the Google Terms of Service | MIT |
| Last release | 2026-05-19 | 2023-05-01 |
| Terms last updated | 2026-07-30 | no document linked |
| Privacy policy last updated | 2026-09-24 | no document linked |
| Customer content may train models | yes, with an opt-out |  |
| Terms restrict automated access | yes |  |
| Terms restrict benchmarking | not found in the text |  |
| Terms or service can change without notice | not found in the text |  |
| Arbitration or class-action waiver | not found in the text |  |
| Popularity | none | 18k stars |