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Head-to-head comparison

DeepSeek V4 Flash 0731 vs GPT-6 Astra

DeepSeek V4 Flash 0731 (DeepSeek) and GPT-6 Astra (OpenAI) compared on the ModelCap Index, API price, context window, provider availability, weight access and every public benchmark board they share. Figures are the same ones shown on the live rankings; nothing here is a hidden score.

Snapshot as of 9 September 2026

As of 9 September 2026, GPT-6 Astra holds the stronger ModelCap Index position (#1 vs #24); DeepSeek V4 Flash 0731 is 277.8× cheaper per output token ($0.18/1M vs $50.00/1M); DeepSeek V4 Flash 0731 offers the longer context window (1.3M vs 1M tokens); and DeepSeek V4 Flash 0731 ships open weights.

Which should you choose?

Choose DeepSeek V4 Flash 0731 if…

  • API cost matters — $0.18/1M output tokens against $50.00/1M, about 277.8× cheaper.
  • your workload is prompt-heavy — input tokens cost $0.065/1M against $10.00/1M.
  • you need the longer context window — 1.3M tokens against 1M.
  • you want to self-host: DeepSeek V4 Flash 0731 ships open weights while GPT-6 Astra is api only.
  • you want provider choice — 28 listed API providers against 2.

Choose GPT-6 Astra if…

  • you want the stronger overall ModelCap Index position — #1 against #24 (93.7 vs 70.7 points).
  • ARC-AGI-2 is your yardstick — 95.0% against 61.4%.
  • AA Intelligence Index is your yardstick — 52.8 against 34.5.
  • AA Terminal-Bench 2.1 is your yardstick — 88.4% against 78.7%.
  • AA Humanity's Last Exam is your yardstick — 54.7% against 38.6%.
  • you want the more recently listed model — GPT-6 Astra was listed 4 September 2026, DeepSeek V4 Flash 0731 31 July 2026.

DeepSeek V4 Flash 0731 vs GPT-6 Astra: specs, pricing and context

Specification comparison of DeepSeek V4 Flash 0731 and GPT-6 Astra
FieldDeepSeek V4 Flash 0731DeepSeekGPT-6 AstraOpenAI
ModelCap Index position#24#1
Index score70.793.7
EvidenceMeasuredMeasured
Input price / 1M tokens$0.065$10.00
Output price / 1M tokens$0.18$50.00
Context window1.3M tokens1M tokens
Max output tokens944K128K
API providers listed282
Weight accessOpen weightsAPI only
Input modalitiesTextFile, Image, Text
First listed31 July 20264 September 2026
PublisherDeepSeekOpenAI

Evidence: 2 public benchmark observations across 2 boards · 4 public benchmark observations across 4 boards. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: DeepSeek V4 Flash 0731 vs GPT-6 Astra

Public benchmark boards where DeepSeek V4 Flash 0731 or GPT-6 Astra has a published result
BoardDeepSeek V4 Flash 0731GPT-6 AstraLeads
LMArena AgentLMArena—12.5%10.4%–14.7%MaxOnly one result
ARC-AGI-2ARC Prize Foundation61.4%Max95.0%MaxGPT-6 Astra
ARC-AGI-3ARC Prize Foundation—62.7%MaxOnly one result
AA Intelligence IndexArtificial Analysis34.5intelligence-index:v4.3:max52.8intelligence-index:v4.3:maxGPT-6 Astra
AA Terminal-Bench 2.1Artificial Analysis78.7%terminal-bench:2.1:terminus-2:e2b:pass-at-1:3-repeats:source-model="DeepSeek V4 Flash 0731 (max)":reasoning=true88.4%terminal-bench:2.1:terminus-2:e2b:pass-at-1:3-repeats:source-model="GPT-6 Astra (max)":reasoning=trueGPT-6 Astra
AA Humanity's Last ExamArtificial Analysis38.6%hle:may-2025:text-only-2158:no-tools:pass-at-1:source-model="DeepSeek V4 Flash 0731 (max)":reasoning=true54.7%hle:may-2025:text-only-2158:no-tools:pass-at-1:source-model="GPT-6 Astra (max)":reasoning=trueGPT-6 Astra
Terminal-Bench 4.0Terminal-Bench (Laude Institute)—58.2%55.4%–61.0%Codex · MaxOnly one result

Scores are the sources' own published figures for each model's best evaluated configuration; ModelCap never re-runs a benchmark.

Want a different pairing? Open the interactive comparison tool to swap either model for any current ranked language model.

DeepSeek V4 Flash 0731 vs GPT-6 Astra: common questions

Is DeepSeek V4 Flash 0731 better than GPT-6 Astra?

GPT-6 Astra ranks higher on the ModelCap Index as of 9 September 2026: #1 against #24. That is a capability ranking built from public benchmark evidence with published uncertainty; whether it is "better" for you also depends on price, context and where you can run it. Their published uncertainty intervals overlap, so the rank difference alone does not establish a reliable capability advantage for your workload.

Is DeepSeek V4 Flash 0731 cheaper than GPT-6 Astra?

DeepSeek V4 Flash 0731 is cheaper on output tokens: $0.18/1M against $50.00/1M. Input tokens are $0.065/1M for DeepSeek V4 Flash 0731 and $10.00/1M for GPT-6 Astra. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens. For 1,000 requests with 2,000 input and 500 output tokens each (2M input + 0.5M output), the listed-rate estimate is $0.22 for DeepSeek V4 Flash 0731 versus $45.00 for GPT-6 Astra. DeepSeek V4 Flash 0731 costs 99.5% less in this scenario. This excludes caching, batch discounts, prompt-length tiers, tool charges and retries; verify the selected endpoint before budgeting.

Which has the bigger context window, DeepSeek V4 Flash 0731 or GPT-6 Astra?

DeepSeek V4 Flash 0731 has the larger context window: 1.3M tokens against 1M.

Which is better for coding, DeepSeek V4 Flash 0731 or GPT-6 Astra?

AA Terminal-Bench 2.1: DeepSeek V4 Flash 0731 78.7%, GPT-6 Astra 88.4% — GPT-6 Astra leads.

Are DeepSeek V4 Flash 0731 and GPT-6 Astra open-weight models?

DeepSeek V4 Flash 0731: Open weights. GPT-6 Astra: API only. Open weights mean the checkpoint can be downloaded and self-hosted under its licence; API-only models are available solely through hosted endpoints.

Where can I run DeepSeek V4 Flash 0731 and GPT-6 Astra?

ModelCap currently lists 28 API providers for DeepSeek V4 Flash 0731 and 2 for GPT-6 Astra, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this DeepSeek V4 Flash 0731 vs GPT-6 Astra comparison?

Every figure comes from the sealed ModelCap dataset published 9 September 2026; the page re-renders within a minute of each data refresh, and the ModelCap Index positions are the same ones shown on the live rankings.

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