Recursive: Flint (free) vs Upstage: Solar Pro 4: Live Promos, Pricing, Hidden Fees & Latency
Recursive: Flint (free) (recursive/flint-v1.0:free) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for Recursive: Flint (free): Activate ephemeral prefix caching to slash input costs by 50% (down to 0/1M) or route via asynchronous Batch API for 50% off standard token rates.
Upstage: Solar Pro 4 (upstage/solar-pro4) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for Upstage: Solar Pro 4: Activate ephemeral prefix caching to slash input costs by 50% (down to 0.075/1M) or route via asynchronous Batch API for 50% off standard token rates.
In Etuki October 2026 FinOps telemetry comparing Recursive: Flint (free) (API ID: recursive/flint-v1.0:free) vs Upstage: Solar Pro 4 (API ID: upstage/solar-pro4), Recursive: Flint (free) offers lower standard input pricing at $0/1M tokens ($0/1M output), while Recursive: Flint (free) leads in cached prefix economics at $0/1M tokens (50% discount). Recursive: Flint (free) achieves a 0ms faster P90 time-to-first-token latency (280ms vs 280ms).
Auto-discovered via live global telemetry registry.
Auto-discovered via live global telemetry registry.
| Specification / FinOps Dimension | Recursive: Flint (free) | Upstage: Solar Pro 4 | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | recursive/flint-v1.0:free | upstage/solar-pro4 | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $0 / $0 | $0.15 / $0.6 | Recursive: Flint (free) |
| Cache Read Price (per 1M) | $0/1M (50% Off) | $0.075/1M (50% Off) | Recursive: Flint (free) |
| Context Window / Max Output | 256K In / 230K Out | 512K In / 128K Out | Recursive: Flint (free) |
| P90 First-Token / Edge Latency | 280ms | 280ms | Recursive: Flint (free) (-0ms) |
Flint is an open-weight mixture-of-experts model from Recursive, with about 2.5B active parameters out of 40B total, built by Recursive's autoresearch system Eureka Machine for cod
Solar Pro 4 is Upstage's cost-efficient large language model, featuring a 524K context window. It is built for long-horizon tasks and agentic workflows, with strong capabilities in
Real-Time Stack Cost & Hidden-Fee Simulator (MAU / Token / Egress / GMV)
Calibrated with Reddit r/FinOps & r/devops telemetry: Includes Context Caching, Bandwidth Egress, and MoR Tax
🛰️Switch from Recursive: Flint (free) to Upstage: Solar Pro 4
Solar Pro 4 is Upstage's cost-efficient large language model, featuring a 524K context window. It is built for long-horizon tasks and agentic workflows, with strong capabilities in Verified P90 latency of 280ms.