Claude Fable 5.1 vs Gemini 3.5 Flash
At a Glance
| Compare | Claude Fable 5.1Anthropic |  Gemini 3.5 FlashGoogle DeepMind |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v2.5 | #1 of 4699.0 score · 3/3 sources · complete | #15 of 4672.1 score · 3/3 sources · complete |
| CostLower is better · Published-token output estimate | #43 of 44$0.824 per LiveBench case | #25 of 44$0.140 per LiveBench case |
| EfficiencyHigher is better · MM Efficiency v1.5 | #22 of 3851.7 score · 3/3 sources · complete | #15 of 3856.8 score · 3/3 sources · complete |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $10.00Anthropic ↗ · Sep 3, 2026 | $1.50Google AI ↗ · Aug 29, 2026 |
| Output priceFrom · USD / 1M tokens | $50.00Anthropic ↗ · Sep 3, 2026 | $9.00Google AI ↗ · Aug 29, 2026 |
| Context windowMaximum documented tokens | 1,000K | 1,049K |
| Model facts checked | Sep 2, 2026View model evidence → | Aug 29, 2026View model evidence → |
Token prices are the lowest available sourced USD rates; input and output may use different providers. Cost ranking estimates output spend on LiveBench, not a full request bill. Ranking methodology →
Available Benchmarks
| Benchmark | Claude Fable 5.1 | Gemini 3.5 Flash |
|---|---|---|
| ARC-AGI-1verified-v1-ba05d69f6453 · verified_score · leader | 97.50100% of row best · percent · Claude Fable 5.1 (Max) | 92.5095% of row best · percent · Gemini 3.5 Flash (High) |
| ARC-AGI-2verified-v2-6c676fa3e9af · verified_score · leader | 90.00100% of row best · percent · Claude Fable 5.1 (XHigh) | 72.0880% of row best · percent · Gemini 3.5 Flash (High) |
| LMArena Document Arenadocument-2026-09-13-d25aabda0010 · arena_rating · leader | 1,512.58100% of row best · rating · claude-fable-5.1-max; 95% CI [1497.40364732, 1527.76498981]; votes 1403; rank 2 | 1,461.4097% of row best · rating · gemini-3.5-flash-high; 95% CI [1452.14297727, 1470.66464631]; votes 4061; rank 22 |
| LMArena Text Arenatext-2026-09-13-d25aabda0010 · arena_rating · leader | 1,507.58100% of row best · rating · claude-fable-5.1-max; 95% CI [1499.42882565, 1515.73467375]; votes 5783; rank 1 | 1,475.7298% of row best · rating · gemini-3.5-flash-medium; 95% CI [1471.24691172, 1480.19960285]; votes 36627; rank 19 |
| LMArena Vision Arenavision-2026-09-13-d25aabda0010 · arena_rating · statistical tie | 1,322.34100% of row best · rating · claude-fable-5.1-max; 95% CI [1310.08723910, 1334.59344910]; votes 2701; rank 2 | 1,307.0099% of row best · rating · gemini-3.5-flash-medium; 95% CI [1299.26365925, 1314.72946839]; votes 9618; rank 11 |
| LiveBench2026-06-25 · overall · leader | 86.82100% of row best · percent · claude-fable-5-1-max-effort · 16,470 output tokens / case | 78.8491% of row best · percent · gemini-3.5-flash-high · 15,522 output tokens / case |
| ToneBench2026-09-11-10-task-4ef099199c9c · overall_score · unverified | 89.71100% of row best · points · Claude Fable 5.1 (max effort) · 60,786 output tokens / case | 75.5884% of row best · points · Gemini 3.5 Flash (high thinking) · 16,743 output tokens / case |
| Overall ResultCounted from the protocol-matched rows above · 1 tie | 5 benchmark winsOverall lead | 0 benchmark wins |
Third-party benchmark Only like-for-like primary-publisher results are shown; raw scores, relative scores, configuration, and token spend remain visible.
Side-by-Side Facts
| Field | Claude Fable 5.1 | Gemini 3.5 Flash |
|---|---|---|
| Developer | Anthropic | Google DeepMind |
| Family | Claude 5 1 | Gemini 3 |
| Model | Claude Fable 5.1 | Gemini 3.5 Flash |
| Version | Claude Fable 5.1 | Gemini 3.5 Flash |
| Lifecycle | active | active |
| Released | 2026-09-01 | Unknown |
| Knowledge cutoff | 2026-06-01 | Unknown |
| Input modalities | Text, Image | Text, Image, Video, Audio, Document |
| Output modalities | Text | Text |
| Context window | 1,000K | 1,049K |
| Total parameters | Unknown | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | No |
| API available | Yes | Yes |
| Self-hostable | No | No |
| Provider access | Anthropic (Standard) | Google AI (Standard), Google Gemini (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, generation, reasoning, tools |
Claude Fable 5.1 Capabilities
Gemini 3.5 Flash Capabilities
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Primary Evidence
Sources and Freshness
Questions
Claude Fable 5.1 vs Gemini 3.5 Flash FAQs
Is Claude Fable 5.1 or Gemini 3.5 Flash better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Fable 5.1 and Gemini 3.5 Flash, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Fable 5.1 or Gemini 3.5 Flash?+
Claude Fable 5.1 is $10.00 and Gemini 3.5 Flash is $1.50 per million tokens, so Gemini 3.5 Flash is cheaper on this metric. Claude Fable 5.1 is $50.00 and Gemini 3.5 Flash is $9.00 per million tokens, so Gemini 3.5 Flash is cheaper on this metric.
Which has a larger context window, Claude Fable 5.1 or Gemini 3.5 Flash?+
Gemini 3.5 Flash has the larger sourced context window. Claude Fable 5.1 supports 1,000K and Gemini 3.5 Flash supports 1,049K.
Which performs better in benchmarks, Claude Fable 5.1 or Gemini 3.5 Flash?+
Claude Fable 5.1 leads the current overall benchmark count. The result uses 6 protocol-matched benchmarks from 3 publishers; it is not a universal quality score.
Can Claude Fable 5.1 or Gemini 3.5 Flash be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Claude Fable 5.1 is not marked open weight; Gemini 3.5 Flash is not marked open weight.
Can Claude Fable 5.1 and Gemini 3.5 Flash understand images?+
Claude Fable 5.1 is documented with image input; Gemini 3.5 Flash is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Fable 5.1 or Gemini 3.5 Flash?+
Claude Fable 5.1 has the larger sourced maximum output: Claude Fable 5.1 supports 128K and Gemini 3.5 Flash supports 66K output tokens.
Do Claude Fable 5.1 and Gemini 3.5 Flash support reasoning and tool use?+
Claude Fable 5.1: reasoning, tool calling, and image input. Gemini 3.5 Flash: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Fable 5.1 or Gemini 3.5 Flash?+
Claude Fable 5.1 has 1 sourced provider route; Gemini 3.5 Flash has 2, so Gemini 3.5 Flash has broader tracked availability.
Which offers better value, Claude Fable 5.1 or Gemini 3.5 Flash?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.