Compare

Claude Sonnet 5.5 vs Deepseek-V4.1-Flash-1017

Pricing per million tokens, context window, capabilities — pulled from each provider's public docs. All 2 are available via the same AIgateway OpenAI-compatible endpoint; flip the model string to switch.

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Claude Sonnet 5.5
anthropic/claude-sonnet-5.5
Deepseek-V4.1-Flash-1017
deepseek/deepseek-v4.1-flash-1017
Provider
Anthropic
Deepseek
Family
Claude 4
DeepSeek
Modality
text
text
Context window
1,000,000 tok
1,048,576 tok
Max output
128,000 tok
32,768 tok
Released
2026-10-06
2026-10-17
License
Proprietary
Open-weight
Input price
$2.00 /1M
$0.300 /1M
Output price
$10.00 /1M
$1.20 /1M
Tools
yes
yes
Streaming
yes
yes
Vision
yes
yes
JSON mode
yes
yes
Reasoning
yes
yes
Prompt caching
—
—
Batch API
—
—
Try it
Open in playground →
Open in playground →
Claude Sonnet 5.5
anthropic/claude-sonnet-5.5
Full spec →

Claude Sonnet 5.5 offers the best combination of speed and intelligence, with adaptive thinking for coding, tool use, reasoning, and long-horizon work.

Strengths
  • General-purpose chat
  • Long context
  • Tool use
Use cases
ChatbotsContent generationAgentic workflows
Deepseek-V4.1-Flash-1017
deepseek/deepseek-v4.1-flash-1017
Full spec →

We introduce DeepSeek-V4.1-Flash, a multimodal Mixture-of-Experts (MoE) model with 552B backbone parameters and support for contexts of up to one million tokens. The model natively processes images and text, and generates text autoregressively.

Strengths
  • General-purpose chat
  • Long context
  • Tool use
Use cases
ChatbotsContent generationAgentic workflows

Compare with another

Gemini 4 Argon vs Claude Sonnet 5.5
google/gemini-4-argon · anthropic/claude-sonnet-5.5
Gemini 4 Argon vs Deepseek-V4.1-Flash-1017
google/gemini-4-argon · deepseek/deepseek-v4.1-flash-1017
Claude Opus 5.5 vs Claude Sonnet 5.5
anthropic/claude-opus-5.5 · anthropic/claude-sonnet-5.5
Claude Opus 5.5 vs Deepseek-V4.1-Flash-1017
anthropic/claude-opus-5.5 · deepseek/deepseek-v4.1-flash-1017
Claude Sonnet 5.5 vs Grok 4.7
anthropic/claude-sonnet-5.5 · xai/grok-4.7
Claude Sonnet 5.5 vs MiniMax M3.1 Flash
anthropic/claude-sonnet-5.5 · minimax/m3.1-flash
Claude Sonnet 5.5 vs Decisions
anthropic/claude-sonnet-5.5 · openai/decisions
Claude Sonnet 5.5 vs Qwen3.8-Max
anthropic/claude-sonnet-5.5 · alibaba/qwen3.8-max
Claude Sonnet 5.5 vs GLM-5.3-Prime
anthropic/claude-sonnet-5.5 · zai-org/glm-5.3-prime
SWITCH BETWEEN THEM

One key, all 2, one line different.

from openai import OpenAI

client = OpenAI(
    base_url="https://api.aigateway.sh/v1",
    api_key="sk-aig-...",
)

# Claude Sonnet 5.5
client.chat.completions.create(
    model="anthropic/claude-sonnet-5.5",
    messages=[{"role":"user","content":"hello"}],
)

# Deepseek-V4.1-Flash-1017
client.chat.completions.create(
    model="deepseek/deepseek-v4.1-flash-1017",
    messages=[{"role":"user","content":"hello"}],
)
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