Which is better, Claude Opus 4.8 or DeepSeek-V4-Flash?

Across 55 shared benchmarks tracked on Vector Wire, Claude Opus 4.8 leads on 46 and DeepSeek-V4-Flash leads on 9 — Claude Opus 4.8 leads on more. Strengths differ by axis; the table below shows every head-to-head number with provenance.

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Claude Opus 4.8 vs DeepSeek-V4-Flash

AnthropicvsDeepSeek55 shared benchmarks46–9 head-to-head

Benchmark	Claude Opus 4.8	DeepSeek-V4-Flash
AA Agentic Index	49.4	61.3
AA Intelligence	57.3	51.8
AA-LCR	73	74.3
AA-Omniscience	28.8	-14.3
Agents' Last Exam	27	25.2
aime_2026	100	95.8
arc_agi_1	92.5	84
ARC-AGI-2	72.1	46
arena_elo	1482	1439
arena_text_factuality	1464	1434
Artificial Analysis Coding Index	74.3	69.1
AutomationBench (Public)	27.2	25.1
AutomationBench Public	27.2	25.1
browsecomp	88.5	73.2
coding_arena_elo	1539	1431
critpt	20.9	16.6
cybergym	83.1	76.7
DeepSWE	59	54.4
DSBench-FullStack	71.6	68.7
DSBench-Hard	71.7	59.6
gdpval	54.2	52.9
GDPval-AA (Elo)	1890	1395
GDPval-AA v2	1593	1189
GPQA Diamond	93.6	90.8
HLE	57.9	38.6
HLE (with tools)	57.9	45.1
HLE (wo / w tools)	57.9	51.5
hmmt_feb_2026	96.7	94.8
IFBench	62.2	79.2
imo_answer_bench	83.5	88.4
livebench_agentic_coding	50.5	46.8
livebench_coding	81.8	75
livebench_data_analysis	66	79.3
livebench_instruction_following	72	65.5
livebench_language	79.7	79.2
livebench_math	94.3	86.8
livebench_reasoning	89.2	86.6
MCP Atlas	83.6	69
nl2repo	69.7	54.2
OmniScience Accuracy	48.8	40.4
OmniScience Non-Hallucination	60.7	15.6
scicode	53.5	49.9
simplebench	64.8	46.3
simpleqa_verified	39.5	45
SWE-bench Multilingual	84.4	73.3
SWE-bench Pro	69.2	52.6
SWE-bench Verified	88.6	79
Tau 3 Banking	27.6	22.9
TauBench V3 - Banking	34.2	39.4
Terminal-Bench 2.0	74.6	56.9
Terminal-Bench 2.1	85	82.7
Terminal-Bench Hard	58.3	38.6
toolathlon	59.9	70.3
τ²-Bench Telecom (AA run)	94.4	95.6
τ³-Bench	27.6	22.9

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.