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Claude Mythos 5.2 vs GPT-6 Astra

Official Anthropic and OpenAI API prices and LMArena scores, checked 2026-11-09. Add up to 2 more models to compare 4.

Claude Fable 5.2 and Mythos 5.2 launched Nov 9, 2026. Read Claude Fable 5.2 and Mythos 5.2: prices, limits and what changed.

Verdict

Claude Mythos 5.2 costs less; quality is n/a.

Claude Mythos 5.2 is 1.3x cheaper on input and output. LMArena has no task both models are ranked on, so quality is n/a here. A medium month (20M input + 5M output tokens) costs $360 on Claude Mythos 5.2 and $450 on GPT-6 Astra.

  • Pick Claude Mythos 5.2 if you want the lower bill ($360 vs $450 for a medium month) or you reuse long prompts (cached input $0.20 vs $1).
  • Pick GPT-6 Astra if nothing here clearly favors it (no lower bill, bigger context, cheaper cache or LMArena lead of 3+ points over Claude Mythos 5.2).
Sample month

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

Claude Mythos 5.2vsGPT-6 Astra
Price per 1M tokens
Input$8 (better)$10
Cached input$0.20 (better)$1
Output$40 (better)$50
Sample month, medium$360 (better)$450
Context
Context window1M1.05M (better)
Quality (LMArena relative score, out of 100)
Codingn/a81
Chatn/a12
Creative writingn/a6
Roleplay and charactersn/a11
Reasoning and mathn/a17
Visionn/a65
Long documentsn/a73
Cheap bulk and agentsn/a81

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

Spec
Claude Mythos 5.2
GPT-6 Astra
Price per 1M tokens
Input$8$10
Cached input$0.20$1
Output$40$50
Blend 3:1$16$20
Sample month, medium$360$450
Context
Context window1M tokens1.05M tokens
Quality (LMArena, out of 100)
CodingNot ranked81/100 #3 of 50
ChatNot ranked12/100 #19 of 51
Creative writingNot ranked6/100 #15 of 51
Roleplay and charactersNot ranked11/100 #14 of 51
Reasoning and mathNot ranked17/100 #21 of 51
VisionNot ranked65/100 #10 of 33
Long documentsNot ranked73/100 #7 of 12
Cheap bulk and agentsNot ranked81/100 #4 of 37
Details
ProviderAnthropicOpenAI
API model idclaude-mythos-5.2gpt-6-astra
NotesVerified organizations only (Cyber and Life Sciences Verification Programs). Same price as Fable 5.2 per Anthropic. Released Nov 9, 2026.Prompts up to 272K. Longer prompts cost $20 in, $75 out.
Sources
Last checked2026-11-092026-11-09
Official pricingAnthropic pricingOpenAI 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): Claude Mythos 5.2 not ranked, GPT-6 Astra #3 of 50 (81/100)
  • Chat (Text Arena): Claude Mythos 5.2 not ranked, GPT-6 Astra #19 of 51 (12/100)
  • Creative writing (Text Arena creative writing): Claude Mythos 5.2 not ranked, GPT-6 Astra #15 of 51 (6/100)
  • Roleplay and characters (Text Arena multi-turn): Claude Mythos 5.2 not ranked, GPT-6 Astra #14 of 51 (11/100)
  • Reasoning and math (Text Arena math): Claude Mythos 5.2 not ranked, GPT-6 Astra #21 of 51 (17/100)
  • Vision (Vision Arena): Claude Mythos 5.2 not ranked, GPT-6 Astra #10 of 33 (65/100)
  • Long documents (Document Arena): Claude Mythos 5.2 not ranked, GPT-6 Astra #7 of 12 (73/100)
  • Cheap bulk and agents (Agent Arena): Claude Mythos 5.2 not ranked, GPT-6 Astra #4 of 37 (81/100)

Pricing details from the official pages

Claude Mythos 5.2 lists $8 input, $40 output, $0.20 cached input per 1M tokens on Anthropic pricing. GPT-6 Astra lists $10 input, $50 output, $1 cached input per 1M tokens on OpenAI pricing. Prices checked 2026-11-09.

  • Claude Mythos 5.2: Verified organizations only (Cyber and Life Sciences Verification Programs). Same price as Fable 5.2 per Anthropic. Released Nov 9, 2026.
  • GPT-6 Astra: Prompts up to 272K. Longer prompts cost $20 in, $75 out.

Sample monthly bill at list price, no caching: Light (2M input + 0.5M output tokens): $36 vs $45. Medium (20M input + 5M output tokens): $360 vs $450. Heavy (200M input + 50M output tokens): $3,600 vs $4,500.

FAQ

Is Claude Mythos 5.2 cheaper than GPT-6 Astra?

Claude Mythos 5.2 costs $8 input and $40 output per 1M tokens; GPT-6 Astra costs $10 and $50. For a medium month (20M input + 5M output tokens) Claude Mythos 5.2 is cheaper: $360 vs $450.

Which is better for coding, Claude Mythos 5.2 or GPT-6 Astra?

Code Arena score: Claude Mythos 5.2 n/a (not ranked), GPT-6 Astra 81/100. We do not guess missing scores.

Which has the bigger context window?

Claude Mythos 5.2: 1M tokens. GPT-6 Astra: 1.05M tokens. Long prompts can cost more; see the pricing notes above.

How much do Claude Mythos 5.2 and GPT-6 Astra cost per month?

Light (2M input + 0.5M output tokens): $36 vs $45. Medium (20M input + 5M output tokens): $360 vs $450. Heavy (200M input + 50M output tokens): $3,600 vs $4,500. 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

Related

Fable 5.2 coverage