Modal vs Fly Machines
Agent-native side-by-side. Scores are curated estimates on a 0–10 scale. Lock-in: higher = worse. Prefer JTBD picks via /api/decide when choosing for a job.
| Dimension | Modal | Fly Machines |
|---|---|---|
| Overall | 8.4 | 8.2 |
| Capability fit | 9.0 | 8.5 |
| Price / performance | 8.2 | 8.5 |
| Latency / reliability | 8.6 | 8.2 |
| Developer & agent DX | 9.6 | 8.0 |
| Privacy / data retention | 7.8 | 7.8 |
| Lock-in risk (higher = worse) | 4.5 | 3.0 |
| Maturity / track record | 8.2 | 8.5 |
| Pricing | As of 2026-10-24 (modal.com/pricing, fetched 2026-10-24): Python-native serverless GPU/CPU billed per second of compute ('You never pay for idle resources'). GPU list rates per second: H100 SXM5 '$0.001097', H200 SXM '$0… | API-driven Firecracker VMs on Fly; pay while running; great for custom sandboxes. |
| Tagline | Depot darling for Python agent backends and bursty GPU jobs. If you think in functions not VMs, start here. | DIY sandbox substrate with global edge. Prefer E2B unless you need custom machine control. |
Modal
Depot darling for Python agent backends and bursty GPU jobs. If you think in functions not VMs, start here. Strengths: Best-in-class Python DX for serverless compute; GPUs + sandboxes + cron in one model; Scale-to-zero economics.
Strengths
- Best-in-class Python DX for serverless compute
- GPUs + sandboxes + cron in one model
- Scale-to-zero economics
Weaknesses
- Premium vs raw RunPod $/GPU-sec sometimes
- Python-centric (polyglot harder)
- Less classic VM control
Fly Machines
DIY sandbox substrate with global edge. Prefer E2B unless you need custom machine control. Strengths: Programmable VMs globally; Firecracker isolation; Integrate with Fly networking.
Strengths
- Programmable VMs globally
- Firecracker isolation
- Integrate with Fly networking
Weaknesses
- You build more sandbox UX yourself
- Not agent-specialized like E2B
- Ops knowledge required
More pairs: anthropic-vs-openai · openai-vs-google-ai · groq-vs-fireworks · fireworks-vs-together · qdrant-vs-pinecone · pinecone-vs-supabase-pgvector · e2b-vs-modal · browserbase-vs-firecrawl