Claude Sonnet 5.5 vs DeepSeek V4.1 Flash 1017
Change modelsClaude Sonnet 5.5Anthropic
IndexAll categories, out of 100.
77.2 ±2.6 best
68.5 ±2.6
GapIndex points below the top.
Top
−8.7
CoverageIndex weight that has results.
95%
95%
SpeedOutput tokens per second.
107/s
261/s best
EloLMArena rating and rank.
1469 best
1463
ReleasedMonth of release.
2026-09
2026-10
Input / 1MUS dollars per 1M input tokens.
$2.00
$0.022 best
Output / 1MUS dollars per 1M output tokens.
$10.00
$0.40 best
Batch output / 1MBatch price per 1M output tokens.
$5.00
$0.20 best
1K chats2K tokens in, 500 out, each.
$9.00
$0.244 best
1K documents20K tokens in, 1K out, each.
$50.00
$0.84 best
1K agent tasks200K tokens in, 20K out, each.
$600.00
$12.40 best
ContextMaximum tokens in one request.
1M
1.05M best
AgenticMulti-step tasks with tools.
77.5 best
72.2
CodingCode writing and repair.
80.8 best
69.8
ReasoningLogic problems and puzzles.
77.8 best
65.0
MultimodalTasks with images and text.
74.4 best
62.2
KnowledgeFacts and expert knowledge.
71.3 best
64.2
MultilingualTasks in many languages.
—
—
InstructionTasks with strict prompt rules.
41.5
68.3 best
MathMath problems.
76.1 best
65.4
Benchmarks
65 sharedOnly Claude Sonnet 5.5: 63Only DeepSeek V4.1 Flash 1017: 29
Claude Sonnet 5.5
DeepSeek V4.1 Flash 1017