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Head-to-head comparison

GPT-4o (2024-08-06) vs GPT-6 Astra

GPT-4o (2024-08-06) (OpenAI) 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 #132); GPT-4o (2024-08-06) is 5× cheaper per output token ($10.00/1M vs $50.00/1M); and GPT-6 Astra offers the longer context window (1M vs 128K tokens).

Which should you choose?

Choose GPT-4o (2024-08-06) if…

  • API cost matters — $10.00/1M output tokens against $50.00/1M, about 5× cheaper.
  • your workload is prompt-heavy — input tokens cost $2.50/1M against $10.00/1M.

Choose GPT-6 Astra if…

  • you want the stronger overall ModelCap Index position — #1 against #132 (93.7 vs 30.1 points).
  • you need the longer context window — 1M tokens against 128K.
  • AA Humanity's Last Exam is your yardstick — 54.7% against 2.3%.
  • you want the more recently listed model — GPT-6 Astra was listed 4 September 2026, GPT-4o (2024-08-06) 6 August 2024.

GPT-4o (2024-08-06) vs GPT-6 Astra: specs, pricing and context

Specification comparison of GPT-4o (2024-08-06) and GPT-6 Astra
FieldGPT-4o (2024-08-06)OpenAIGPT-6 AstraOpenAI
ModelCap Index position#132#1
Index score30.193.7
EvidenceMeasuredMeasured
Input price / 1M tokens$2.50$10.00
Output price / 1M tokens$10.00$50.00
Context window128K tokens1M tokens
Max output tokens16K128K
API providers listed22
Weight accessAPI onlyAPI only
Input modalitiesText, Image, FileFile, Image, Text
First listed6 August 20244 September 2026
PublisherOpenAIOpenAI

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: GPT-4o (2024-08-06) vs GPT-6 Astra

Public benchmark boards where GPT-4o (2024-08-06) or GPT-6 Astra has a published result
BoardGPT-4o (2024-08-06)GPT-6 AstraLeads
Arena codingArena (LMArena)13601352–1368—Only one result
LMArena AgentLMArena—12.5%10.4%–14.7%MaxOnly one result
ARC-AGI-2ARC Prize Foundation—95.0%MaxOnly one result
ARC-AGI-3ARC Prize Foundation—62.7%MaxOnly one result
AA Intelligence IndexArtificial Analysis—52.8intelligence-index:v4.3:maxOnly one result
AA Terminal-Bench 2.1Artificial Analysis—88.4%terminal-bench:2.1:terminus-2:e2b:pass-at-1:3-repeats:source-model="GPT-6 Astra (max)":reasoning=trueOnly one result
AA τ²-Bench TelecomArtificial Analysis28.9%tau2:telecom:dual-control:pass-at-1:3-repeats:source-model="GPT-4o (Aug)":reasoning=false—Only one result
AA Humanity's Last ExamArtificial Analysis2.3%hle:may-2025:text-only-2158:no-tools:pass-at-1:source-model="GPT-4o (Aug)":reasoning=false54.7%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.

GPT-4o (2024-08-06) vs GPT-6 Astra: common questions

Is GPT-4o (2024-08-06) better than GPT-6 Astra?

GPT-6 Astra ranks higher on the ModelCap Index as of 9 September 2026: #1 against #132. 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 do not overlap, but the aggregate Index does not predict performance on every task; compare the relevant benchmark configurations before choosing.

Is GPT-4o (2024-08-06) cheaper than GPT-6 Astra?

GPT-4o (2024-08-06) is cheaper on output tokens: $10.00/1M against $50.00/1M. Input tokens are $2.50/1M for GPT-4o (2024-08-06) 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 $10.00 for GPT-4o (2024-08-06) versus $45.00 for GPT-6 Astra. GPT-4o (2024-08-06) costs 77.8% 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, GPT-4o (2024-08-06) or GPT-6 Astra?

GPT-6 Astra has the larger context window: 1M tokens against 128K.

Which is better for coding, GPT-4o (2024-08-06) or GPT-6 Astra?

The two models do not share a coding benchmark board on ModelCap yet, so no head-to-head coding score is published; the ModelCap Index position is the closest overall signal.

Are GPT-4o (2024-08-06) and GPT-6 Astra open-weight models?

GPT-4o (2024-08-06): API only. 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 GPT-4o (2024-08-06) and GPT-6 Astra?

ModelCap currently lists 2 API providers for GPT-4o (2024-08-06) 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 GPT-4o (2024-08-06) 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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