text model comparison
DeepSeek-V4.1-Flash vs Solar Pro 4
DeepSeek-V4.1-Flash and Solar Pro 4 are both current text models, from DeepSeek and Upstage. Both cost $0.30 per 1M input tokens. On Arena Text, DeepSeek-V4.1-Flash scores 1475 Elo and Solar Pro 4 1386 Elo (Arena, measured October 8, 2026). DeepSeek-V4.1-Flash has the larger context window, 1,000,000 vs 512,000 tokens.
Data verified October 13, 2026 · Dataset 2026-10-13
Side by side
Standard-tier prices in effect today. The better value in each row is highlighted.
| Fact | DeepSeek-V4.1-Flash | Solar Pro 4 |
|---|---|---|
| Price per 1M input tokens | $0.30 | $0.30 |
| Price per 1M output tokens | $1.20 | $1.20 |
| Cost of 10M input and 2M output tokens | $5.40 | $5.40 |
| Arena Text | 1475 Elo (#21 of 49) (better) | 1386 Elo (#45 of 49) |
| GPQA Diamond | 89.8% (#28 of 40) | Not measured |
| FrontierMath Tiers 1-3 (v2) | 67.4% (#23 of 40) | Not measured |
| Provider | DeepSeek | Upstage |
| Release date | September 10, 2026 | August 6, 2026 |
| Access | API and open weights | API only |
| Context window | 1,000,000 tokens | 512,000 tokens |
| Max output | 384,000 tokens | 128,000 tokens |
| Input | text, image | text |
| Output | text | text |
When to choose each
DeepSeek-V4.1-Flash
Best for
- High-volume agent and multimodal workloads where per-token cost dominates
- Teams that want a frontier-adjacent model they can also self-host under MIT terms
Watch out for
- The recorded API rates are the peak-hour prices; DeepSeek charges half outside 01:00-04:00 and 06:00-10:00 UTC on weekdays
- Running the open weights moves cost to your own infrastructure, which the token rates here do not represent
Solar Pro 4
Best for
- Korean and Japanese enterprise workloads
- Multi-step agent work with tool calls
Watch out for
- A closed model: Upstage does not disclose its parameter count
- Several of its published benchmark figures are in-house evaluations
DeepSeek-V4.1-Flash vs Solar Pro 4 FAQ
Which is cheaper, DeepSeek-V4.1-Flash or Solar Pro 4?
Both cost $0.30 per 1M input tokens. For 10M input and 2M output tokens, DeepSeek-V4.1-Flash costs $5.40 and Solar Pro 4 $5.40 at standard rates.
Which scores higher on independent benchmarks, DeepSeek-V4.1-Flash or Solar Pro 4?
DeepSeek-V4.1-Flash leads on Arena Text, 1475 Elo to 1386 Elo. Scores are independent evaluations, not either vendor's launch figures.
Which has the larger context window, DeepSeek-V4.1-Flash or Solar Pro 4?
DeepSeek-V4.1-Flash has the larger context window, 1,000,000 vs 512,000 tokens.
Can I run DeepSeek-V4.1-Flash or Solar Pro 4 myself?
DeepSeek-V4.1-Flash is released as open weights you can run yourself; Solar Pro 4 is available through its provider's API only.
Related comparisons
Production evaluation
Choosing between DeepSeek-V4.1-Flash and Solar Pro 4?
Public benchmarks narrow the shortlist. We run both on your own tasks, data and cost limits, then build the routing and review controls to run the winner in production.
- A head-to-head evaluation on your real workload
- Routing between models by cost and difficulty