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GPT-6 Astra vs Gemini 4 Argon

Official OpenAI and Google API prices and LMArena scores, checked 2026-11-05. Add up to 2 more models to compare 4.

Verdict

Gemini 4 Argon is cheaper and wins more LMArena tasks.

Gemini 4 Argon is 5x cheaper on input and output. Gemini 4 Argon scores 90 points higher for creative writing; GPT-6 Astra scores 35 points higher for coding. Across 6 shared LMArena tasks, Gemini 4 Argon leads 4 to 2. A medium month (20M input + 5M output tokens) costs $450 on GPT-6 Astra and $90 on Gemini 4 Argon.

  • Pick GPT-6 Astra if you care most about coding (+35) and agent tasks (+14).
  • Pick Gemini 4 Argon if you want the lower bill ($90 vs $450 for a medium month), you care most about creative writing (+90), roleplay (+87) and chat (+84) or you reuse long prompts (cached input $0.10 vs $1).
Sample month

Medium: 20M input + 5M output tokens a month at list price (short-context rate, no caching or batch discounts).

GPT-6 AstravsGemini 4 Argon
Price per 1M tokens
Input$10$2 (better)
Cached input$1$0.10 (better)
Output$50$10 (better)
Sample month, medium$450$90 (better)
Context
Context window1.05M (better)1M
Quality (LMArena relative score, out of 100)
Coding87 (better)52
Chat16100 (better)
Creative writing696 (better)
Roleplay and characters13100 (better)
Reasoning and math25100 (better)
Vision66n/a
Long documents78n/a
Cheap bulk and agents81 (better)67

Marked side is better: lower for prices, higher for context and scores. Bars are scaled to the larger of the two.

Spec
GPT-6 Astra
Gemini 4 Argon
Price per 1M tokens
Input$10$2
Cached input$1$0.10
Output$50$10
Blend 3:1$20$4
Sample month, medium$450$90
Context
Context window1.05M tokens1M tokens
Quality (LMArena, out of 100)
Coding87/100 #2 of 5052/100 #8 of 50
Chat16/100 #19 of 51100/100 #1 of 51
Creative writing6/100 #17 of 5196/100 #2 of 51
Roleplay and characters13/100 #13 of 51100/100 #1 of 51
Reasoning and math25/100 #18 of 51100/100 #1 of 51
Vision66/100 #10 of 33Not ranked
Long documents78/100 #6 of 11Not ranked
Cheap bulk and agents81/100 #3 of 3767/100 #7 of 37
Details
ProviderOpenAIGoogle
API model idgpt-6-astragemini-4-argon
NotesPrompts up to 272K. Longer prompts cost $20 in, $75 out.Launch price through Nov 30, 2026. From Dec 1: $4 in, $20 out.
Sources
Last checked2026-11-052026-11-05
Official pricingOpenAI pricingGoogle pricing

API prices in USD per 1M tokens from each provider's official pricing page. Blend 3:1 = (3 x input + output) / 4. Sample month = stated input and output tokens at the list price, no caching. Quality: relative score out of 100 on each LMArena leaderboard (100 = top model we price on that board, n/a = not ranked there), data licensed CC BY 4.0. See how we pick.

Where each one ranks on LMArena

Relative score out of 100 on each leaderboard (100 = the top model we price there), with the rank among the models from our API price table that appear on that board.

  • Coding (Code Arena): GPT-6 Astra #2 of 50 (87/100), Gemini 4 Argon #8 of 50 (52/100)
  • Chat (Text Arena): GPT-6 Astra #19 of 51 (16/100), Gemini 4 Argon #1 of 51 (100/100)
  • Creative writing (Text Arena creative writing): GPT-6 Astra #17 of 51 (6/100), Gemini 4 Argon #2 of 51 (96/100)
  • Roleplay and characters (Text Arena multi-turn): GPT-6 Astra #13 of 51 (13/100), Gemini 4 Argon #1 of 51 (100/100)
  • Reasoning and math (Text Arena math): GPT-6 Astra #18 of 51 (25/100), Gemini 4 Argon #1 of 51 (100/100)
  • Vision (Vision Arena): GPT-6 Astra #10 of 33 (66/100), Gemini 4 Argon not ranked
  • Long documents (Document Arena): GPT-6 Astra #6 of 11 (78/100), Gemini 4 Argon not ranked
  • Cheap bulk and agents (Agent Arena): GPT-6 Astra #3 of 37 (81/100), Gemini 4 Argon #7 of 37 (67/100)

Pricing details from the official pages

GPT-6 Astra lists $10 input, $50 output, $1 cached input per 1M tokens on OpenAI pricing. Gemini 4 Argon lists $2 input, $10 output, $0.10 cached input per 1M tokens on Google pricing. Prices checked 2026-11-05.

  • GPT-6 Astra: Prompts up to 272K. Longer prompts cost $20 in, $75 out.
  • Gemini 4 Argon: Launch price through Nov 30, 2026. From Dec 1: $4 in, $20 out.

Sample monthly bill at list price, no caching: Light (2M input + 0.5M output tokens): $45 vs $9. Medium (20M input + 5M output tokens): $450 vs $90. Heavy (200M input + 50M output tokens): $4,500 vs $900.

FAQ

Is GPT-6 Astra cheaper than Gemini 4 Argon?

GPT-6 Astra costs $10 input and $50 output per 1M tokens; Gemini 4 Argon costs $2 and $10. For a medium month (20M input + 5M output tokens) Gemini 4 Argon is cheaper: $90 vs $450.

Which is better for coding, GPT-6 Astra or Gemini 4 Argon?

On LMArena's Code Arena GPT-6 Astra scores 87/100 (#2 of 50) and Gemini 4 Argon 52/100 (#8 of 50), so GPT-6 Astra is ahead by 35 points.

Which has the bigger context window?

GPT-6 Astra: 1.05M tokens. Gemini 4 Argon: 1M tokens. Long prompts can cost more; see the pricing notes above.

How much do GPT-6 Astra and Gemini 4 Argon cost per month?

Light (2M input + 0.5M output tokens): $45 vs $9. Medium (20M input + 5M output tokens): $450 vs $90. Heavy (200M input + 50M output tokens): $4,500 vs $900. Pick your own token counts in the plan vs API calculator.

Where do these numbers come from?

Prices come from each provider's official pricing page, checked daily. Quality is the relative score on the LMArena leaderboard dataset, licensed CC BY 4.0. Where a model is not ranked we show n/a.

Sources

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