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Claude Fable 5.2 vs Claude Sonnet 5.5

Official Anthropic 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 Sonnet 5.5 costs less; quality is n/a.

Claude Sonnet 5.5 is 4x 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 Fable 5.2 and $90 on Claude Sonnet 5.5.

  • Pick Claude Fable 5.2 if nothing here clearly favors it (no lower bill, bigger context, cheaper cache or LMArena lead of 3+ points over Claude Sonnet 5.5).
  • Pick Claude Sonnet 5.5 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).
Sample month

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

Claude Fable 5.2vsClaude Sonnet 5.5
Price per 1M tokens
Input$8$2 (better)
Cached input$0.20$0.10 (better)
Output$40$10 (better)
Sample month, medium$360$90 (better)
Context
Context window1M1M
Quality (LMArena relative score, out of 100)
Codingn/a84
Chatn/a7
Creative writingn/a25
Roleplay and charactersn/a0
Reasoning and mathn/a31
Visionn/a17
Long documentsn/an/a
Cheap bulk and agentsn/a87

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

Spec
Claude Fable 5.2
Claude Sonnet 5.5
Price per 1M tokens
Input$8$2
Cached input$0.20$0.10
Output$40$10
Blend 3:1$16$4
Sample month, medium$360$90
Context
Context window1M tokens1M tokens
Quality (LMArena, out of 100)
CodingNot ranked84/100 #2 of 50
ChatNot ranked7/100 #20 of 51
Creative writingNot ranked25/100 #11 of 51
Roleplay and charactersNot ranked0/100 #24 of 51
Reasoning and mathNot ranked31/100 #16 of 51
VisionNot ranked17/100 #16 of 33
Long documentsNot rankedNot ranked
Cheap bulk and agentsNot ranked87/100 #2 of 37
Details
ProviderAnthropicAnthropic
API model idclaude-fable-5.2claude-sonnet-5.5
NotesReleased Nov 9, 2026. 128K max output. 5-minute cache writes $10. Fast mode $16 in, $80 out.5-minute cache writes $2.50.
Sources
Last checked2026-11-092026-11-09
Official pricingAnthropic 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): Claude Fable 5.2 not ranked, Claude Sonnet 5.5 #2 of 50 (84/100)
  • Chat (Text Arena): Claude Fable 5.2 not ranked, Claude Sonnet 5.5 #20 of 51 (7/100)
  • Creative writing (Text Arena creative writing): Claude Fable 5.2 not ranked, Claude Sonnet 5.5 #11 of 51 (25/100)
  • Roleplay and characters (Text Arena multi-turn): Claude Fable 5.2 not ranked, Claude Sonnet 5.5 #24 of 51 (0/100)
  • Reasoning and math (Text Arena math): Claude Fable 5.2 not ranked, Claude Sonnet 5.5 #16 of 51 (31/100)
  • Vision (Vision Arena): Claude Fable 5.2 not ranked, Claude Sonnet 5.5 #16 of 33 (17/100)
  • Long documents (Document Arena): Claude Fable 5.2 not ranked, Claude Sonnet 5.5 not ranked
  • Cheap bulk and agents (Agent Arena): Claude Fable 5.2 not ranked, Claude Sonnet 5.5 #2 of 37 (87/100)

Pricing details from the official pages

Claude Fable 5.2 lists $8 input, $40 output, $0.20 cached input per 1M tokens on Anthropic pricing. Claude Sonnet 5.5 lists $2 input, $10 output, $0.10 cached input per 1M tokens on Anthropic pricing. Prices checked 2026-11-09.

  • Claude Fable 5.2: Released Nov 9, 2026. 128K max output. 5-minute cache writes $10. Fast mode $16 in, $80 out.
  • Claude Sonnet 5.5: 5-minute cache writes $2.50.

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

FAQ

Is Claude Fable 5.2 cheaper than Claude Sonnet 5.5?

Claude Fable 5.2 costs $8 input and $40 output per 1M tokens; Claude Sonnet 5.5 costs $2 and $10. For a medium month (20M input + 5M output tokens) Claude Sonnet 5.5 is cheaper: $90 vs $360.

Which is better for coding, Claude Fable 5.2 or Claude Sonnet 5.5?

Code Arena score: Claude Fable 5.2 n/a (not ranked), Claude Sonnet 5.5 84/100. We do not guess missing scores.

Which has the bigger context window?

Claude Fable 5.2: 1M tokens. Claude Sonnet 5.5: 1M tokens. Both list the same window.

How much do Claude Fable 5.2 and Claude Sonnet 5.5 cost per month?

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

Related

Fable 5.2 coverage