Which is cheaper, Claude Haiku 5.5 and DeepSeek V4 Pro?

Claude Haiku 5.5 has the lowest input price. Per 1M input tokens: Claude Haiku 5.5 from $0.10 and DeepSeek V4 Pro from $1.74.

Which has the larger context window, Claude Haiku 5.5 and DeepSeek V4 Pro?

DeepSeek V4 Pro has the largest context window: Claude Haiku 5.5 1,000,000 tokens and DeepSeek V4 Pro 1,048,576 tokens.

Can I switch between Claude Haiku 5.5 and DeepSeek V4 Pro without changing my code?

Yes. All of them are served through FastRouter's OpenAI-compatible API, so switching is a change of the model parameter (anthropic/claude-haiku-5.5, deepseek/deepseek-v4-pro).

Claude Haiku 5.5 vs DeepSeek V4 Pro

Side-by-side pricing per provider, context window, benchmark scores and speed, all on one OpenAI-compatible API.

Estimate monthly cost for these models

Claude Haiku 5.5 Anthropicanthropic/claude-haiku-5.5

DeepSeek V4 Pro DeepSeekdeepseek/deepseek-v4-pro

Creator

Anthropic

DeepSeek

Released

Oct 7, 2026

Apr 24, 2026

Context window

1.05M

Max output

128K

384K

Input / 1MLowest provider price

$0.10

$1.74$1.74–$2.40 across 3

Output / 1MLowest provider price

$0.50

$3.48$3.48–$4.80 across 3

Providers

IntelligenceArtificial Analysis index

34.3

23.1

LatencyMedian time to first token

—

4.9s

ThroughputMedian tokens per second

—

<1 t/s

Accepts

Image, Text

Text

Produces

Text

Tool calling

Yes

Structured output

Yes

Reasoning

Yes

Claude Haiku 5.5 vs DeepSeek V4 Pro: summary

Claude Haiku 5.5 and DeepSeek V4 Pro are both available through FastRouter's OpenAI-compatible API, so switching between them is a change of model id, not a new integration.

Claude Haiku 5.5, from Anthropic, has a 1,000,000-token context window, costs from $0.10/1M input and $0.50/1M output tokens across 3 providers and scores 34.3 on the Artificial Analysis Intelligence Index.

DeepSeek V4 Pro, from DeepSeek, has a 1,048,576-token context window, costs from $1.74/1M input and $3.48/1M output tokens across 3 providers and scores 23.1 on the Artificial Analysis Intelligence Index.

Claude Haiku 5.5 is the cheapest on input, 17× cheaper than the next model, DeepSeek V4 Pro has the largest context window and Claude Haiku 5.5 scores highest for intelligence.

Switch with one line

client = OpenAI(base_url="https://api.fastrouter.ai/api/v1", api_key="<FASTROUTER_API_KEY>") client.chat.completions.create(model="anthropic/claude-haiku-5.5", messages=[...]) # or client.chat.completions.create(model="deepseek/deepseek-v4-pro", messages=[...])

Full API docs

Frequently asked questions

More comparisons

Benchmark scores sourced from ArtificialAnalysis