Claude Opus 5.5 vs DeepSeek V4 Flash 0731

Price, context window & benchmark comparison

Claude Opus 5.5

Anthropic

$4.00 / $20.00

Input / Output · per 1M tokens

DeepSeek V4 Flash 0731

DeepSeek

$0.03 / $0.32

Input / Output · per 1M tokens

Compare different models

Verdict: DeepSeek V4 Flash 0731 is 78.0× cheaper than Claude Opus 5.5 on a typical 3:1 input/output mix. Claude Opus 5.5 scores higher on the Artificial Analysis Intelligence Index (57.6 vs 34.3). DeepSeek V4 Flash 0731 has the larger context window (1.3M vs 1M).

	Claude Opus 5.5	DeepSeek V4 Flash 0731
Input price / 1M	$4.00	$0.03
Output price / 1M	$20.00	$0.32
Blended price (3:1)	$8.00	$0.10
Cached input / 1M	$0.20	$0.016
Context window	1M	1.3M
Max output	128K	944K
Intelligence index	57.6	34.3
Coding index	—	69.1
Providers	11	30
Best provider uptime (30m)	100.0%	100.0%
Vision input	Yes	No
Reasoning	Yes	Yes
Tool calling	Yes	Yes
Released	2026-09-22	2026-07-31
Retirement	—	—

Cost calculator

Input tokens / requestOutput tokens / requestRequests / day

FAQ

Which is cheaper, Claude Opus 5.5 or DeepSeek V4 Flash 0731?

DeepSeek V4 Flash 0731 is 78.0× cheaper than Claude Opus 5.5 on a typical 3:1 input/output mix.

Claude Opus 5.5 vs DeepSeek V4 Flash 0731: which has a bigger context window?

Claude Opus 5.5: 1,000,000 tokens. DeepSeek V4 Flash 0731: 1,310,720 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: Claude Opus 5.5 ≈ $18,000, DeepSeek V4 Flash 0731 ≈ $220.00.

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