Which is better, Claude Fable 5 or Claude Sonnet 4.6?

Across 54 shared benchmarks tracked on Vector Wire, Claude Fable 5 leads on 50 and Claude Sonnet 4.6 leads on 4 — Claude Fable 5 leads on more. Strengths differ by axis; the table below shows every head-to-head number with provenance.

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Claude Fable 5 vs Claude Sonnet 4.6

AnthropicvsAnthropic54 shared benchmarks50–4 head-to-head

Benchmark	Claude Fable 5	Claude Sonnet 4.6
AA Agentic Index	56.6	61.6
AA Intelligence	62.1	48.4
AA-LCR	76.7	74
AA-Omniscience	43.3	12.2
arc_agi_1	90.5	86.5
ARC-AGI-2	76.8	60.4
arena_elo	1508	1472
arena_text_factuality	1486	1460
arena_vision	1307	1278
Artificial Analysis Coding Index	76.5	63
Blueprint-Bench 2	38.6	6.7
browsecomp	88	76.2
charxiv_rq	89.4	72.4
coding_arena_elo	1626	1523
critpt	28.6	3.1
DeepSWE 1.1	70	30
Finance Agent v2	56.3	51
GDP (Surge AI)	29.8	78.6
gdpval	61.9	54.8
GDPval-AA (Elo)	1932	1676
GDPval-AA v2	1760	1381
GPQA Diamond	92.6	89.9
healthbench_professional	66	44.2
HLE	64.5	49
HLE (with tools)	64.5	46.8
IFBench	63.5	56.6
Legal Agent Benchmark	13.3	5.4
Legal Agent Benchmark (Harvey's Held-Out Set)	13.3	5.4
livebench	78.3	75.5
livebench_agentic_coding	62.2	42.6
livebench_coding	86	79.3
livebench_data_analysis	80.5	78
livebench_instruction_following	75.8	63.2
livebench_language	90.7	76.1
livebench_math	96	87
livebench_reasoning	89.7	84.8
MCP Atlas	84.7	69.5
MMMU-Pro	84.2	75.6
officeqa_pro	69.9	53.4
OmniScience Accuracy	65.3	40.9
OmniScience Non-Hallucination	36.4	51.6
OSWorld-Verified	85	78.5
scicode	60.2	47
simpleqa_verified	68.3	29
SWE-bench Pro	80	58.1
SWE-bench Verified	95	79.6
TauBench V3 - Banking	38.1	34.4
Terminal-Bench 2.1	88	71.2
Terminal-Bench Hard	62.9	59.1
toolathlon	61.7	49.4
Toolathlon Avg turns	19.8	16.5
Toolathlon Pass@∞	55.6	38
τ²-Bench Telecom (AA run)	98.5	97.9
τ³-Bench	26.8	30.5

Best tracked score per model per benchmark (default configuration; source-attributed). ↓ marks lower-is-better metrics. Open either model for its full surface, provenance and pricing.