DeepSeek-V4.1-Flash vs GPT-6 Astra: Specs & Benchmark Comparison
DeepSeek-V4.1-Flash is developed by DeepSeek, while GPT-6 Astra comes from OpenAI. Both were released in September 2026. DeepSeek-V4.1-Flash has a published size of about 552 billion parameters; OpenAI has not disclosed the parameter count of GPT-6 Astra.
The two models share 8 published benchmarks. GPT-6 Astra leads on 5 of them, DeepSeek-V4.1-Flash on 3. The widest gaps are on Agents' Last Exam, where GPT-6 Astra scores 59.3% against 31.8%; ExploitGym, where GPT-6 Astra scores 42.4% against 15.3%. Averaged across everything we track, DeepSeek-V4.1-Flash sits at 60.2% and GPT-6 Astra at 74.4%.
DeepSeek-V4.1-Flash is the cheaper API at $0.30 per million input tokens and $1.20 per million output tokens, roughly 33 times cheaper than GPT-6 Astra at $10 and $50. Both accept a context window of about 1M tokens. Both accept text and images as input.
| Characteristic | DeepSeek-V4.1-Flash | GPT-6 Astra |
|---|---|---|
| Company | DeepSeek | OpenAI |
| Release Date | September 10, 2026 | September 4, 2026 |
| Parameters | 552B | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.1M |
| Context (output) | 393K | 128K |
| Input Price / 1M | $0.30 | $10.00 |
| Output Price / 1M | $1.20 | $50.00 |
| Average Score | 60.2% | 74.4% |
| Benchmarks | ||
| Agents' Last Exam | 31.8% | 59.3% |
| ExploitGym | 15.3% | 42.4% |
| Terminal-Bench 4.0 | 31.2% | 57.7% |
| SEC-bench Pro | 62.8% | 85.4% |
| AutomationBench | 54.8% | 41.4% |
| Humanity's Last Exam (with tools, text-only) | 63.9% | 57.2% |
| GPQA Diamond | 90.9% | 96.0% |
| DeepSWE 1.1 | 74.2% | 74.1% |
Visual Benchmark Comparison
Verdict
Both models show equal results — the choice depends on your specific use case.
Both models show comparable average scores: DeepSeek-V4.1-Flash — 0.6, GPT-6 Astra — 0.7.
DeepSeek-V4.1-Flash is 40.0x cheaper: input $0.30/1M vs $10.00/1M tokens.
GPT-6 Astra supports a larger context: 1M vs 1M tokens.
Both models were released around the same time: 9/10/2026 and 9/4/2026.
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Frequently Asked Questions
Which is better for coding — DeepSeek-V4.1-Flash or GPT-6 Astra?
Which model is cheaper — DeepSeek-V4.1-Flash or GPT-6 Astra?
Which has a larger context window — DeepSeek-V4.1-Flash or GPT-6 Astra?
The DeepSeek-V4.1-Flash and GPT-6 Astra comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the DeepSeek-V4.1-Flash or GPT-6 Astra page. See also the complete list of AI model comparisons.