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Gemini 4 Carbon vs Claude Fable 5.2

Official Google and Anthropic API prices and LMArena scores, checked 2026-11-14. 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

Gemini 4 Carbon costs less; Claude Fable 5.2 wins more LMArena tasks.

Gemini 4 Carbon is 4x cheaper on input and output. Claude Fable 5.2 scores 35 points higher for agent tasks. Across 2 shared LMArena tasks, Claude Fable 5.2 leads 2 to 0. A medium month (20M input + 5M output tokens) costs $90 on Gemini 4 Carbon and $360 on Claude Fable 5.2.

  • Pick Gemini 4 Carbon if you want the lower bill ($90 vs $360 for a medium month) or you reuse long prompts (cached input $0.10 vs $0.20).
  • Pick Claude Fable 5.2 if you care most about agent tasks (+35) and coding (+25).
Sample month

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

Gemini 4 CarbonvsClaude Fable 5.2
Price per 1M tokens
Input$2 (better)$8
Cached input$0.10 (better)$0.20
Output$10 (better)$40
Sample month, medium$90 (better)$360
Context
Context window1M1M
Quality (LMArena relative score, out of 100)
Coding75100 (better)
Chat100n/a
Creative writing92n/a
Roleplay and characters100n/a
Reasoning and mathn/an/a
Visionn/an/a
Long documentsn/an/a
Cheap bulk and agents65100 (better)

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

Spec
Gemini 4 Carbon
Claude Fable 5.2
Price per 1M tokens
Input$2$8
Cached input$0.10$0.20
Output$10$40
Blend 3:1$4$16
Sample month, medium$90$360
Context
Context window1M tokens1M tokens
Quality (LMArena, out of 100)
Coding75/100 #4 of 53100/100 #1 of 53
Chat100/100 #1 of 54Not ranked
Creative writing92/100 #3 of 54Not ranked
Roleplay and characters100/100 #1 of 54Not ranked
Reasoning and mathNot rankedNot ranked
VisionNot rankedNot ranked
Long documentsNot rankedNot ranked
Cheap bulk and agents65/100 #3 of 40100/100 #1 of 40
Details
ProviderGoogleAnthropic
API model idgemini-4-carbonclaude-fable-5.2
NotesLaunch price through Nov 30, 2026. From Dec 1: $4 in, $20 out. Implicit caching only. Not on the Free tier. Public API from Nov 10, 2026.Released Nov 9, 2026. 128K max output. 5-minute cache writes $10. Fast mode $16 in, $80 out.
Sources
Last checked2026-11-142026-11-14
Official pricingGoogle pricingAnthropic 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): Gemini 4 Carbon #4 of 53 (75/100), Claude Fable 5.2 #1 of 53 (100/100)
  • Chat (Text Arena): Gemini 4 Carbon #1 of 54 (100/100), Claude Fable 5.2 not ranked
  • Creative writing (Text Arena creative writing): Gemini 4 Carbon #3 of 54 (92/100), Claude Fable 5.2 not ranked
  • Roleplay and characters (Text Arena multi-turn): Gemini 4 Carbon #1 of 54 (100/100), Claude Fable 5.2 not ranked
  • Reasoning and math (Text Arena math): Gemini 4 Carbon not ranked, Claude Fable 5.2 not ranked
  • Vision (Vision Arena): Gemini 4 Carbon not ranked, Claude Fable 5.2 not ranked
  • Long documents (Document Arena): Gemini 4 Carbon not ranked, Claude Fable 5.2 not ranked
  • Cheap bulk and agents (Agent Arena): Gemini 4 Carbon #3 of 40 (65/100), Claude Fable 5.2 #1 of 40 (100/100)

Pricing details from the official pages

Gemini 4 Carbon lists $2 input, $10 output, $0.10 cached input per 1M tokens on Google pricing. Claude Fable 5.2 lists $8 input, $40 output, $0.20 cached input per 1M tokens on Anthropic pricing. Prices checked 2026-11-14.

  • Gemini 4 Carbon: Launch price through Nov 30, 2026. From Dec 1: $4 in, $20 out. Implicit caching only. Not on the Free tier. Public API from Nov 10, 2026.
  • Claude Fable 5.2: Released Nov 9, 2026. 128K max output. 5-minute cache writes $10. Fast mode $16 in, $80 out.

Sample monthly bill at list price, no caching: Light (2M input + 0.5M output tokens): $9 vs $36. Medium (20M input + 5M output tokens): $90 vs $360. Heavy (200M input + 50M output tokens): $900 vs $3,600.

FAQ

Is Gemini 4 Carbon cheaper than Claude Fable 5.2?

Gemini 4 Carbon costs $2 input and $10 output per 1M tokens; Claude Fable 5.2 costs $8 and $40. For a medium month (20M input + 5M output tokens) Gemini 4 Carbon is cheaper: $90 vs $360.

Which is better for coding, Gemini 4 Carbon or Claude Fable 5.2?

On LMArena's Code Arena Gemini 4 Carbon scores 75/100 (#4 of 53) and Claude Fable 5.2 100/100 (#1 of 53), so Claude Fable 5.2 is ahead by 25 points.

Which has the bigger context window?

Gemini 4 Carbon: 1M tokens. Claude Fable 5.2: 1M tokens. Both list the same window.

How much do Gemini 4 Carbon and Claude Fable 5.2 cost per month?

Light (2M input + 0.5M output tokens): $9 vs $36. Medium (20M input + 5M output tokens): $90 vs $360. Heavy (200M input + 50M output tokens): $900 vs $3,600. 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