Which is better, Claude Sonnet 4.6 or Gemini 3.5 Flash?

Across 53 shared benchmarks tracked on Vector Wire, Claude Sonnet 4.6 leads on 20 and Gemini 3.5 Flash leads on 33 — Gemini 3.5 Flash leads on more. Strengths differ by axis; the table below shows every head-to-head number with provenance.

SEEDRefresh Models —Deals —Regulatory —Sources —

Claude Sonnet 4.6 vs Gemini 3.5 Flash

AnthropicvsGoogle53 shared benchmarks20–33 head-to-head

Benchmark	Claude Sonnet 4.6	Gemini 3.5 Flash
AA Agentic Index	61.6	70.4
AA Intelligence	48.4	52
AA-LCR	74	81
AA-Omniscience	12.2	21.2
apexAgents	28	47.1
arc_agi_1	86.5	92.5
ARC-AGI-2	60.4	72.1
arena_elo	1472	1477
arena_text_factuality	1460	1466
Artificial Analysis Coding Index	63	70.1
Blueprint-Bench 2	6.7	33.6
charxiv_reasoning_with_tools	85.3	84.9
charxiv_rq	72.4	84.2
coding_arena_elo	1523	1490
critpt	3.1	13.1
DeepSWE 1.1	30	37
Finance Agent v2	51	57.9
finance_agent	63.3	57.9
frontiermath_tier_4	8.3	14.6
gdpval	54.8	57.8
GDPval-AA (Elo)	1676	1656
GDPval-AA v2	1381	1357
GPQA Diamond	89.9	92.2
HLE	49	42.7
Humanity’s Last Exam	33.2	40.2
IFBench	56.6	76.3
itbenchSre	39.8	40.3
Legal Agent Benchmark	5.4	0.8
Legal Agent Benchmark (Harvey's Held-Out Set)	5.4	0.8
livebench	75.5	75
livebench_agentic_coding	42.6	49
livebench_coding	79.3	78.2
livebench_data_analysis	78	64.9
livebench_instruction_following	63.2	75.6
livebench_language	76.1	84.6
livebench_math	87	88.2
livebench_reasoning	84.8	82
MCP Atlas	69.5	83.6
MMMU-Pro	75.6	84.3
mrcr_v2_8needle_128k_average	84.9	77.3
OmniScience Accuracy	40.9	51.4
OmniScience Non-Hallucination	51.6	38.2
OSWorld-Verified	78.5	78.4
scicode	47	53.1
simpleqa_verified	29	68.4
SWE-bench Pro	58.1	55.1
TauBench V3 - Banking	34.4	32.2
Terminal-Bench 2.0	59.1	76.2
Terminal-Bench 2.1	71.2	78.7
Terminal-Bench Hard	59.1	46.2
toolathlon	49.4	56.5
τ²-Bench Telecom (AA run)	97.9	95.6
τ³-Bench	30.5	25.4

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.