Claude Fable 5.1 vs Claude Opus 5
At a Glance
| Compare | Claude Fable 5.1Anthropic | Claude Opus 5Anthropic |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v4.4 | #2 of 5799.0 score · 3/3 sources · complete | UnrankedNot in the 57-model eligible cohort |
| CostLower is better · Published-token output estimate | #27 of 27$0.824 per LiveBench case | UnrankedNot in the 27-model eligible cohort |
| EfficiencyHigher is better · MM Efficiency v1.9 | #14 of 2749.5 score · 3/3 sources · complete | UnrankedNot in the 27-model eligible cohort |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $10.00Anthropic ↗ · Sep 3, 2026 | $5.00Anthropic ↗ · Sep 3, 2026 |
| Output priceFrom · USD / 1M tokens | $50.00Anthropic ↗ · Sep 3, 2026 | $25.00Anthropic ↗ · Sep 3, 2026 |
| Context windowMaximum documented tokens | 1,000K | 1,000K |
| Model facts checked | Sep 2, 2026View model evidence → | Aug 28, 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 | Claude Opus 5 |
|---|---|---|
| ARC-AGI-1verified-v1-613c385b0c93 · verified_score · statistical tie | 97.50100% of row best · percent · Claude Fable 5.1 (Max) | 97.50100% of row best · percent · Claude Opus 5 (Max) |
| ARC-AGI-2verified-v2-be40992860f9 · verified_score · leader | 90.00100% of row best · percent · Claude Fable 5.1 (XHigh) | 90.42100% of row best · percent · Claude Opus 5 (Max) |
| LMArena Agent Arenaagent-2026-10-16-a64ca3b12b6e · outcome_score · leader | 14.03100% of row best · score · Claude Fable 5.1 (Max); 95% CI [12.03932907, 16.02502568]; sessions 16374; observations 1913479; rank 3 | 8.6895% of row best · score · Claude Opus 5 (Max); 95% CI [6.99592257, 10.36856205]; sessions 23770; observations 3146528; rank 8 |
| LMArena Document Arenadocument-2026-09-13-a64ca3b12b6e · arena_rating · statistical tie | 1,512.58100% of row best · rating · claude-fable-5.1-max; 95% CI [1497.40364732, 1527.76498981]; votes 1403; rank 2 | 1,516.27100% of row best · rating · claude-opus-5-high; 95% CI [1509.24512533, 1523.28765667]; votes 8794; rank 1 |
| LMArena Search Arenasearch-2026-10-13-a64ca3b12b6e · arena_rating · statistical tie | 1,245.85100% of row best · rating · claude-fable-5.1-high; 95% CI [1238.79268797, 1252.89817971]; votes 12782; rank 5 | 1,241.57100% of row best · rating · claude-opus-5-high; 95% CI [1234.69644002, 1248.43868868]; votes 13285; rank 6 |
| LMArena Vision Arenavision-2026-10-09-a64ca3b12b6e · arena_rating · statistical tie | 1,318.24100% of row best · rating · claude-fable-5.1-max; 95% CI [1308.61778049, 1327.86146111]; votes 4648; rank 4 | 1,319.22100% of row best · rating · claude-opus-5-high; 95% CI [1312.47954379, 1325.95953993]; votes 16665; rank 3 |
| LiveBench2026-06-25-90f8d44da965 · overall · leader | 86.82100% of row best · percent · claude-fable-5-1-max-effort · 16,470 output tokens / case | 83.4496% of row best · percent · claude-opus-5-max-effort · 14,826 output tokens / case |
| ToneBench2026-10-17-10-task-e9c76358afb2 · overall_score · unverified | 84.53100% of row best · points · Claude Fable 5.1 (max effort) · 68,653 output tokens / case | 83.2598% of row best · points · Claude Opus 5 (max effort) · 26,820 output tokens / case |
| Overall ResultCounted from the protocol-matched rows above · 4 ties | 2 benchmark winsOverall lead | 1 benchmark win |
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 | Claude Opus 5 |
|---|---|---|
| Developer | Anthropic | Anthropic |
| Family | Claude 5 1 | Claude 5 |
| Model | Claude Fable 5.1 | Claude Opus 5 |
| Version | Claude Fable 5.1 | Claude Opus 5 |
| Lifecycle | active | active |
| Released | 2026-09-01 | 2026-07-24 |
| Knowledge cutoff | 2026-06-01 | Unknown |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 1,000K | 1,000K |
| 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) | Anthropic (Standard), Deepinfra (Standard), Openrouter (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, generation, reasoning, tools |
Claude Fable 5.1 Capabilities
Claude Opus 5 Capabilities
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Primary Evidence
Sources and Freshness
Questions
Claude Fable 5.1 vs Claude Opus 5 FAQs
Is Claude Fable 5.1 or Claude Opus 5 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Fable 5.1 and Claude Opus 5, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Fable 5.1 or Claude Opus 5?+
Claude Fable 5.1 is $10.00 and Claude Opus 5 is $5.00 per million tokens, so Claude Opus 5 is cheaper on this metric. Claude Fable 5.1 is $50.00 and Claude Opus 5 is $25.00 per million tokens, so Claude Opus 5 is cheaper on this metric.
Which has a larger context window, Claude Fable 5.1 or Claude Opus 5?+
Both models have the same sourced context window: 1,000,000 tokens each.
Which performs better in benchmarks, Claude Fable 5.1 or Claude Opus 5?+
Claude Fable 5.1 leads the current overall benchmark count. The result uses 7 protocol-matched benchmarks from 3 publishers; it is not a universal quality score.
Can Claude Fable 5.1 or Claude Opus 5 be self-hosted?+
Both models have the same sourced self-hosting status: unsupported. Claude Fable 5.1 is not marked open weight; Claude Opus 5 is not marked open weight.
Can Claude Fable 5.1 and Claude Opus 5 understand images?+
Claude Fable 5.1 is documented with image input; Claude Opus 5 is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Fable 5.1 or Claude Opus 5?+
Both models have the same sourced maximum output: 128,000 tokens each.
Do Claude Fable 5.1 and Claude Opus 5 support reasoning and tool use?+
Claude Fable 5.1: reasoning, tool calling, and image input. Claude Opus 5: 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 Claude Opus 5?+
Claude Fable 5.1 has 1 sourced provider route; Claude Opus 5 has 3, so Claude Opus 5 has broader tracked availability.
Which offers better value, Claude Fable 5.1 or Claude Opus 5?+
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.