AI model comparison
DeepSeek V4.1 Flash vs Solar Pro 4
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
DeepSeek
DeepSeek V4.1 Flash
DeepSeek V4.1 Flash is a sparse mixture-of-experts model from DeepSeek, and the first built on the company's Causal Encoder-Decoder (CED) architecture.
- Input / 1M
- $0.15
- Output / 1M
- $0.60
- Context
- 1.05M
Upstage
Solar Pro 4
Solar Pro 4 is Upstage's cost-efficient large language model, featuring a 524K context window.
- Input / 1M
- $0.09
- Output / 1M
- $0.36
- Context
- 524K
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
Solar Pro 4
1.7x cheaper for a typical chat
Higher intelligence score
DeepSeek V4.1 Flash
39.5 vs 28.2 on Artificial Analysis
Larger context window
DeepSeek V4.1 Flash
1.05M vs 524K tokens
Newer release
DeepSeek V4.1 Flash
Released September 10, 2026
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
DeepSeek V4.1 Flash39.5Coding index
DeepSeek V4.1 FlashNot availableAgentic index
DeepSeek V4.1 FlashNot availablePricing
DeepSeek V4.1 Flash vs Solar Pro 4 API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | DeepSeek V4.1 Flash | |
|---|---|---|
| Input tokensPer 1M tokens | $0.15 | $0.09 |
| Output tokensPer 1M tokens | $0.60 | $0.36 |
| Cached input (read)Per 1M tokens | $0.00 | $0.02 |
| Cache writePer 1M tokens | Not available | Not available |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
DeepSeek V4.1 Flash$0.60Coding task
30K in, 4K out
DeepSeek V4.1 Flash$6.90$2.49 cachedLong document summary
150K in, 2K out
DeepSeek V4.1 Flash$23.70$1.65 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | DeepSeek V4.1 Flash | |
|---|---|---|
| Context window | 1.05M tokens | 524K tokens |
| Max output | 393K tokens | 131K tokens |
| Input types | Image, Text | Text |
| Output types | Text | Text |
| Reasoning effort levels | Max, High, Low | Max, Extra high, High, Medium, Low, Minimal, None |
| Default reasoning effort | High | Medium |
| Release date | September 10, 2026 | August 10, 2026 |
Features
Supported features
API features available for each model.
| Metric | DeepSeek V4.1 Flash | |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Supported | Supported |
| Stop sequences | Supported | Not supported |
| Deterministic seed | Supported | Not supported |
| Verbosity control | Not supported | Not supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
DeepSeek V4.1 FlashView full model details- DeepSeek V4.1 Flash vs GLM 5.3 Flash
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- DeepSeek V4.1 Flash vs GLM 5.3
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- DeepSeek V4.1 Flash vs Ling 3.1 Flash
- DeepSeek V4.1 Flash vs Qwen3.8 Flash
- DeepSeek V4.1 Flash vs Qwen3.8 27B
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- DeepSeek V4.1 Flash vs Qwen3.7 Flash
- DeepSeek V4.1 Flash vs Qwen3.8 2.4T A95B
- DeepSeek V4.1 Flash vs GPT-6 Luna Pro
- DeepSeek V4.1 Flash vs Muse Spark 1.2
- DeepSeek V4.1 Flash vs GPT-5.4
- DeepSeek V4.1 Flash vs Grok 4.5
- DeepSeek V4.1 Flash vs GLM 5.3 FlashX
- DeepSeek V4.1 Flash vs DeepSeek V4 Flash Vision Exp
- DeepSeek V4.1 Flash vs Mistral Nemo
- DeepSeek V4.1 Flash vs Gemini 3.6 Flash
- DeepSeek V4.1 Flash vs Muse Spark 1.1
- DeepSeek V4.1 Flash vs GPT-5.6 Luna Pro
- Solar Pro 4 vs MiMo-V2.6-Flash
- Solar Pro 4 vs DeepSeek V4 Flash 0731
- Solar Pro 4 vs DeepSeek V4 Flash 0423
- Solar Pro 4 vs Hy3
- Solar Pro 4 vs Muse Spark 1.3 Contributor
- Solar Pro 4 vs MiniMax M3
- Solar Pro 4 vs Solar Mini 4
- Solar Pro 4 vs DeepSeek V4 Pro 0423
- Solar Pro 4 vs MiMo-V2.5
- Solar Pro 4 vs MiMo-V2.5-Pro
- Solar Pro 4 vs Ling 3.0 Flash VL
- Solar Pro 4 vs Ling 3.0 Flash Fin
Our take
Solar Pro 4 is 1.7x cheaper for a typical chat. DeepSeek V4.1 Flash scores higher on the Artificial Analysis Intelligence Index (39.5 vs 28.2). DeepSeek V4.1 Flash has the larger context window (1.05M vs 524K tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is DeepSeek V4.1 Flash or Solar Pro 4 cheaper?
Solar Pro 4 is cheaper for a typical chat (2K input tokens and 500 output tokens). Solar Pro 4 costs $0.09 per 1M input tokens and $0.36 per 1M output tokens, while DeepSeek V4.1 Flash costs $0.15 per 1M input tokens and $0.60 per 1M output tokens.
Which has a bigger context window, DeepSeek V4.1 Flash or Solar Pro 4?
DeepSeek V4.1 Flash supports up to 1.05M tokens of context, compared with 524K for Solar Pro 4.
Is DeepSeek V4.1 Flash smarter than Solar Pro 4?
On the Artificial Analysis Intelligence Index, DeepSeek V4.1 Flash scores 39.5 and Solar Pro 4 scores 28.2, putting DeepSeek V4.1 Flash ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use DeepSeek V4.1 Flash and Solar Pro 4 at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see DeepSeek V4.1 Flash and Solar Pro 4 answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to DeepSeek V4.1 Flash and Solar Pro 4 at the same time. Compare the answers side by side and keep the best one.