DeepSeek V4.1 Flash vs GLM-5.3-Flash vs GPT-6.1 Sol
GLM-5.3-Flash comes out ahead, 79 to 72 and 47 on our weighted score, and it is the cheaper option too.
DeepSeekDeepSeek V4.1 Flash
72/100- ECI155.0
- Price$0.15 / $0.60
- Context1M
- Our pick
Z.ai (Zhipu)GLM-5.3-Flash
79/100- ECI151.9
- Price$0.15 / $0.50
- Context1M
OpenAIGPT-6.1 Sol
47/100- ECI—
- Price$2.00 / $10.00
- Context1.05M
GLM-5.3-Flash is our pick
GLM-5.3-Flash is the better all-round choice, scoring 79/100 against DeepSeek V4.1 Flash (72) and GPT-6.1 Sol (47). It leads on price and inputs & features. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
- CapabilityNot enough dataNo independent benchmark covers every model here yet
- Lowest priceGLM-5.3-FlashGLM-5.3-Flash $0.237 · DeepSeek V4.1 Flash $0.263 · GPT-6.1 Sol $4.00 per 1M tokens (3:1 blend)
- Longest contextGPT-6.1 SolGPT-6.1 Sol 1,050,000 · DeepSeek V4.1 Flash 1,000,000 · GLM-5.3-Flash 1,000,000 tokens
- Widest inputsGLM-5.3-FlashDeepSeek V4.1 Flash: Text, Images · GLM-5.3-Flash: Text, Images, PDFs, Video · GPT-6.1 Sol: Text, Images, PDFs
- Self-hostingDeepSeek V4.1 Flash and GLM-5.3-FlashPublishes downloadable weights (MIT)
| Measure | Weight | DeepSeek V4.1 Flash | GLM-5.3-Flash | GPT-6.1 Sol |
|---|---|---|---|---|
| Price | 50% | 77 | 79 | 21 |
| Inputs & features | 30% | 70 | 90 | 80 |
| Context window | 20% | 60 | 60 | 61 |
| Overall | 100% | 72/100 | 79/100 | 47/100 |
Left out because at least one model lacks the data: capability. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | DeepSeek V4.1 FlashDeepSeek | GLM-5.3-FlashZ.ai (Zhipu) | GPT-6.1 SolOpenAI |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | 155.0 (best) | 151.9 | — |
| ECI rank | #29 of 148 (best) | #42 of 148 | — |
| GPQA DiamondGraduate-level science questions | — | 90.2% | 95.4% (best) |
| FrontierMath Tiers 1–3Research-level mathematics | — | 55.8% | 93.7% (best) |
| OTIS Mock AIME 2024–2025Competition mathematics | — | 93.9% | 100% (best) |
| SimpleQA VerifiedShort factual questions | — | — | 73.9% |
| Price per million tokens | |||
| Input | $0.15 (best) | $0.15 (best) | $2.00 |
| Output | $0.60 | $0.50 (best) | $10.00 |
| Cached input | $0.003 (best) | $0.03 | $0.10 |
| Blended (3:1) | $0.263 | $0.237 (best) | $4.00 |
| Long-context rate | Same rate | Same rate | Over 272K: $4.00 / $15.00 |
| Price source | Official DeepSeek API | Official Z.AI API | Official OpenAI API |
| Limits | |||
| Context window | 1,000,000 tokens | 1,000,000 tokens | 1,050,000 tokens (best) |
| Max output | 384,000 tokens (best) | 131,072 tokens | 128,000 tokens |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | Yes | Yes |
| PDFs | No | Yes | Yes |
| Audio | No | No | No |
| Video | No | Yes | No |
| Reasoning | Yeslow · high · max | Yeslow · high · max | Yeslow · medium · high · xhigh · max |
| Tool calling | Yes | Yes | Yes |
| Structured output | Yes | Yes | Yes |
| Availability | |||
| Weights | OpenMIT | Open | Proprietary |
| API model ID | deepseek-flash | glm-5.3-flash | gpt-6.1-sol |
| API providers | 50 | 65 (best) | 21 |
| Released | Sep 10, 2026 | Aug 26, 2026 | Sep 29, 2026 |
| Knowledge cutoff | May 2025 | — | Apr 30, 2026 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- DeepSeek V4.1 Flash$2.70
- GLM-5.3-Flash$2.50
- GPT-6.1 Sol$40.00
Which should you choose?
Which is better: DeepSeek V4.1 Flash, GLM-5.3-Flash or GPT-6.1 Sol?
GLM-5.3-Flash is the better all-round choice, scoring 79/100 against DeepSeek V4.1 Flash (72) and GPT-6.1 Sol (47). It leads on price and inputs & features. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
Which is cheaper, DeepSeek V4.1 Flash, GLM-5.3-Flash or GPT-6.1 Sol?
GLM-5.3-Flash is cheaper at $0.15 input / $0.50 output per million tokens (official Z.AI API price). DeepSeek V4.1 Flash costs $0.15 input / $0.60 output per million tokens (official DeepSeek API price); GPT-6.1 Sol costs $2.00 input / $10.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $0.237 per million tokens for GLM-5.3-Flash versus $0.263 for DeepSeek V4.1 Flash (1.1× as much) and $4.00 for GPT-6.1 Sol (17× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. DeepSeek V4.1 Flash has an ECI of 155.0, GLM-5.3-Flash has an ECI of 151.9 and GPT-6.1 Sol has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for DeepSeek V4.1 Flash, GLM-5.3-Flash and GPT-6.1 Sol yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. All three support tool calling for agent workflows.
Which has the bigger context window?
GPT-6.1 Sol has the largest context window at 1,050,000 tokens, against 1,000,000 for DeepSeek V4.1 Flash and 1,000,000 for GLM-5.3-Flash. Maximum output per response: DeepSeek V4.1 Flash up to 384,000, GLM-5.3-Flash up to 131,072, GPT-6.1 Sol up to 128,000 tokens.
Which can read images, PDFs, audio or video?
DeepSeek V4.1 Flash accepts text and images; GLM-5.3-Flash accepts text, images, PDFs and video; GPT-6.1 Sol accepts text, images and PDFs. GLM-5.3-Flash handles the widest range of inputs.
Are any of these open source?
DeepSeek V4.1 Flash and GLM-5.3-Flash publishes its weights (MIT) and can be self-hosted; GPT-6.1 Sol is proprietary.
Which is newer?
GPT-6.1 Sol is the newest, released Sep 29, 2026. DeepSeek V4.1 Flash came out Sep 10, 2026; GLM-5.3-Flash came out Aug 26, 2026. Knowledge cutoff: DeepSeek V4.1 Flash May 2025, GPT-6.1 Sol Apr 30, 2026.
How do you decide the winner?
Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.
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