GPT-6 Astra vs DeepSeek-V4-Flash
GPT-6 Astra wins on Overall, Coding, Multimodal. Every numeric field is compared below, with a worked monthly-cost example and a pick rule for each use case.
Verdict at a glance
Choose GPT-6 Astra if you…
- Best-in-class computer use
- Frontier research & reasoning
- Autonomous long-horizon tasks
- Strongest cybersecurity (gated)
- Best for: Computer use, Deep research, Cybersecurity
Choose DeepSeek-V4-Flash if you…
- Rock-bottom price
- Fast
- Open source
- Fit for simple tasks
- Best for: Ultra-fast response, Low cost, High concurrency
Head-to-head aggregate scores
Scores are 0–100, aggregated from public benchmark information and independently weighted across three leaderboards. Rank is out of 26 tracked models.
Aggregated from public sources and independently weighted; methodology on the Terms page. Scores within 3 points are treated as statistically tied.
Specs & pricing — every field side by side
List API prices in USD per 1M tokens. The highlighted cell is the stronger value/capability on that row.
| Dimension | GPT-6 Astra | DeepSeek-V4-Flash | Verdict |
|---|---|---|---|
| Vendor | OpenAI (US) | DeepSeek (CN) | Different vendors |
| Released | 2026.09 | 2026.04 | GPT-6 Astra is newer |
| Overall (rank) | 96 · #1 | 67 · #19 | GPT-6 Astra +29 |
| Coding | 97 · #3 | 65 · #20 | GPT-6 Astra +32 |
| Multimodal | 90 · #7 | 65 · #24 | GPT-6 Astra +25 |
| Context window | 1.05M | 1M | GPT-6 Astra larger |
| Max output | 128K | 128K | Tie |
| Effective-context | 96 | 90 | GPT-6 Astra more reliable |
| Input $/1M | $10 | $0.14 | DeepSeek-V4-Flash cheaper |
| Output $/1M | $50 | $0.28 | DeepSeek-V4-Flash cheaper |
| Cache discount | 50% off | none | GPT-6 Astra deeper |
| Speed | ~35 tok/s | ~85 tok/s | DeepSeek-V4-Flash faster |
| TTFT | 1.1s | 0.3s | DeepSeek-V4-Flash snappier |
| Function calling | 94 | 72 | GPT-6 Astra ahead |
| Refusal rate | ~13% | ~5% | DeepSeek-V4-Flash less restrictive |
| English | 99 | 75 | GPT-6 Astra |
| Chinese | 72 | 80 | DeepSeek-V4-Flash |
| Modalities | text, image | text | different coverage |
| Open weights | No | Yes | DeepSeek-V4-Flash is open |
| Fine-tuning | No | Yes | |
| Free tier | No free API tier; Fast mode delivers up to ~2x throughput | DeepSeek App free | |
| SOC2 / no-train | yes / yes | no / yes | |
| Private deployment | No | Yes | DeepSeek-V4-Flash |
Fields drawn from vendor public documentation and the Modelspectra 26-model dataset; speed varies with network, concurrency and prompt length. Verify current pricing before purchase.
Dimension-by-dimension analysis
Reasoning & overall intelligence
GPT-6 Astra leads the overall aggregate by 29 points (96 vs 67). That is a meaningful, not marginal, edge on hard, multi-step reasoning, while DeepSeek-V4-Flash remains a strong generalist that is not out of its depth on routine work.
Agentic coding
This is a decisive gap: GPT-6 Astra scores 97 against 65. On multi-file edits, SWE-style tickets and long-horizon agent loops GPT-6 Astra needs fewer correction turns; DeepSeek-V4-Flash is still competent for scripts and assisted completion but trails as task complexity rises.
Multimodal
GPT-6 Astra leads multimodal 90 vs 65. A concrete modality difference: GPT-6 Astra additionally handles image. Neither emits native video, so the comparison is about parsing images and documents, not generation.
Speed & latency
DeepSeek-V4-Flash is faster in interactive use: ~85 tok/s with 0.3s TTFT versus ~35 tok/s with 1.1s TTFT (about 2.4× the throughput). For conversational UIs where perceived responsiveness drives retention, that edge is a real product factor even when raw reasoning is lower.
Context: window vs usable recall
Nominal windows are 1.05M for GPT-6 Astra and 1M for DeepSeek-V4-Flash. Effective-context scores point the same way as window size — GPT-6 Astra is ahead on usable recall (96 vs 90), so prefer it for long-document work where details cannot be missed.
Price & total cost
DeepSeek-V4-Flash is the cheaper API at $0.14/$0.28 versus GPT-6 Astra at $10/$50 per 1M input/output tokens — list input is about 71.4× lower. Cache discounts (GPT-6 Astra 50%) shift the effective bill, worked out below.
Chinese vs English
English: GPT-6 Astra 99 vs DeepSeek-V4-Flash 75. Chinese: 72 vs 80. For Chinese-language production, DeepSeek-V4-Flash is the stronger pick. Note that non-Chinese models generally require overseas network access for their APIs.
Tool use & ecosystem
Function-calling score: GPT-6 Astra 94 vs DeepSeek-V4-Flash 72, so GPT-6 Astra has the edge on structured tool use. Fine-tuning is available from DeepSeek-V4-Flash. Factor in existing SDK/plugin familiarity — switching cost often outweighs a few-point tool-use gap.
Cost worked example — same workload, real token math
Assume a production workload of 100M input + 30M output tokens per month, with 90% of input tokens served from cache. Figures use public list prices.
| Scenario · per month | GPT-6 Astra | DeepSeek-V4-Flash | Gap |
|---|---|---|---|
| List priceno cache applied | $2,500100M in × $10 + 30M out × $50 | $22100M in × $0.14 + 30M out × $0.28 | 113.64×gap |
| With caching90% of inputs cache-hit | $2,05090M cached in × $5 + 10M in × $10 + 30M out × $50 | $22no published cache discount | 93.18×gap |
Illustrative model; your input/output mix and cache-hit ratio change the result. Prices are list rates before any enterprise agreement.