Claude Opus 4.1 Thinking (Build 20250805)

Claude Opus 4.1 is the premier thinking model for complex reasoning. Using its advanced API, developers tackle zero-defect coding and deep scientific synthesis with a 500k context window, ensuring logical consistency in every agentic workflow.

Modalities

Context

API Usage Examples

curl --request POST "https://gptproto.com/v1/chat/completions" \
  --header "Authorization: Bearer $GPTPROTO_API_KEY" \
  --header "Content-Type: application/json" \
  --data '{
    "model": "claude-opus-4-1-20250805-thinking",
    "messages": [
      {
        "role": "user",
        "content": "Hello"
      }
    ]
  }'

Claude Opus 4.1 20250805 Thinking pricing

Chat, coding agents & document work. Priced per 1M tokens — input, cached input and output are billed separately. GPTProto is 10% below official rates.

Your usage

Model

Claude · ≈ 148M tokens/mo (48M cached)

Monthly volume

OpenRouter

List + 5.5% credit fee

$2164.86

per month

Input (non-cached)$506.40

Cache read$75.96

Output$1582.50

Claude

Direct from Claude (list price)

$2,052

per month

Input (non-cached)$480

Cache read$72

Output$1,500

BEST VALUE

GPTProto

10% off official

$1846.80

per month

After discount$1846.80

Effective$1846.80

Monthly cost by source

OpenRouter

$2164.86

Claude

$2,052

GPTProto

$1846.80

Save $205.20 / month

on GPTProto vs Claude (−10%)

Annual savings ≈ $2462.40 · pay as you go

OpenRouter costs include its ~5.5% credit purchase fee. GPTProto applies a per-model discount (10–30% off) and your bonus credits are also spent at discounted rates — savings compound. Estimates assume a 60% cache hit rate.

Related Models

All Models

Claude Opus 4.1 Thinking (Build 20250805)

Current

byClaude200K context$13.5/M input$67.5/M output

DeepSeek Flash

byDeepSeek$0.3/M input$1.2/M output

Hy4 Preview

byHunyuan1.05M context$0.7923/M input$2.376/M output

GPT 6 Astra

byOpenAI1.05M context$8/M input$40/M output

Gemini 3.8 Flash

byGoogle1.05M context$0.9/M input$4.5/M output

Claude Fable 5.1

byClaude1M context$9/M input$45/M output

Qwen3.8 Max 0902

byQwen1M context$1.8/M input$5.4/M output

GLM 5.3 Flash

byZ-AI1.31M context$0.15/M input$0.5/M output

DeepSeek v4 Flash Vision Exp

byDeepSeek1.05M context$0.3/M input$1.2/M output

GLM 5.3

byZ-AI1.31M context$1.26/M input$3.96/M output

Gemini 3.7 Flash

byGoogle1.05M context$0.9/M input$4.5/M output

Grok 4.6

byGrok500K context$1.2/M input$3.6/M output

Qwen3.8 Max

byQwen1M context$1.8/M input$5.4/M output

Claude Opus 5

byClaude1M context$4.5/M input$22.5/M output

Gemini 3.6 Flash

byGoogle1.05M context$0.9/M input$4.5/M output

Kimi K3

byMoonshotAI1.05M context$2.7/M input$13.5/M output

GPT 5.6 Luna

byOpenAI1.05M context$0.16/M input$0.96/M output

GPT 5.6 Terra

byOpenAI1.05M context$1.6/M input$9.6/M output

Grok 4.5

byGrok500K context$1.2/M input$3.6/M output

Claude Sonnet 5

byClaude1M context$1.8/M input$9/M output

Minimax M3

byMiniMax1.05M context$0.48/M input$0.96/M output

GLM 5.2

byZ-AI1.05M context$1.26/M input$3.96/M output

Claude Fable 5

byClaude1M context$9/M input$45/M output

Qwen3.7 Max

byQwen1M context$0.36/M input$1.44/M output

Claude Opus 4.8 Thinking

byClaude1M context$4.5/M input$22.5/M output

Claude Opus 4.8

byClaude1M context$4.5/M input$22.5/M output

DeepSeek v4 Flash

byDeepSeek1.05M context$0.3/M input$1.2/M output

Grok 4.3

byGrok1M context$0.75/M input$1.5/M output

Kimi K2.6

byMoonshotAI262K context$0.855/M input$3.6/M output

Minimax M2.5

byMiniMax205K context$0.24/M input$0.96/M output

Kimi K2.5

byMoonshotAI262K context$0.54/M input$2.7/M output

Doubao Seed 1.6 Thinking (Build 250715)

byBytedance262K context$0.0971/M input$0.9714/M output

Doubao Seed 1.6 Thinking (Build 250615)

byBytedance262K context$0.0971/M input$0.9714/M output

Doubao Seed 1.6 Flash (Build 250615)

byBytedance262K context$0.0182/M input$0.1821/M output

Model					Input → Output
Claude Opus 4.1 Thinking (Build 20250805)Current $		200K	$13.50 / $67.50 per 1M	$16.88 / $1.35 per 1M	Input: TextInput: Document Output: Text
DeepSeek Flash $	—	—	$0.30 / $1.20 per 1M	— / $0.006 per 1M	Input: TextInput: Image Output: Text
Hy4 Preview $		1.05M	$0.79 / $2.38 per 1M	— / $0.04 per 1M	Input: Text Output: Text
GPT 6 Astra $		1.05M	$8.00 / $40.00 per 1M	$10.00 / $0.80 per 1M	Input: TextInput: ImageInput: Document Output: Text
Gemini 3.8 Flash $		1.05M	$0.90 / $4.50 per 1M	$0.60 / $0.09 per 1M	Input: TextInput: ImageInput: VideoInput: DocumentInput: Audio Output: Text
Claude Fable 5.1 $		1M	$9.00 / $45.00 per 1M	$11.25 / $0.23 per 1M	Input: TextInput: ImageInput: Document Output: Text
Qwen3.8 Max 0902 $		1M	$1.80 / $5.40 per 1M	$2.25 / $0.23 per 1M	Input: TextInput: ImageInput: VideoInput: DocumentInput: Audio Output: Text
GLM 5.3 Flash $	—	1.31M	$0.15 / $0.50 per 1M	— / $0.03 per 1M	Input: TextInput: ImageInput: VideoInput: Document Output: Text
DeepSeek v4 Flash Vision Exp $	—	1.05M	$0.30 / $1.20 per 1M	— / $0.006 per 1M	Input: TextInput: Image Output: Text
GLM 5.3 $		1.31M	$1.26 / $3.96 per 1M	— / $0.23 per 1M	Input: TextInput: ImageInput: Document Output: Text
Gemini 3.7 Flash $		1.05M	$0.90 / $4.50 per 1M	$0.60 / $0.09 per 1M	Input: TextInput: ImageInput: Document Output: Text
Grok 4.6 $		500K	$1.20 / $3.60 per 1M	— / $0.30 per 1M	Input: TextInput: Image Output: Text
Qwen3.8 Max $		1M	$1.80 / $5.40 per 1M	$2.25 / $0.23 per 1M	Input: TextInput: ImageInput: VideoInput: Document Output: Text
Claude Opus 5 $		1M	$4.50 / $22.50 per 1M	$5.63 / $0.45 per 1M	Input: TextInput: ImageInput: Document Output: Text
Gemini 3.6 Flash $		1.05M	$0.90 / $4.50 per 1M	$0.60 / $0.09 per 1M	Input: TextInput: ImageInput: Document Output: Text
Kimi K3 $		1.05M	$2.70 / $13.50 per 1M	$0.27 / $0.27 per 1M	Input: TextInput: ImageInput: Document Output: Text
GPT 5.6 Luna $		1.05M	$0.16 / $0.96 per 1M	$0.20 / $0.02 per 1M	Input: TextInput: ImageInput: Document Output: Text
GPT 5.6 Terra $		1.05M	$1.60 / $9.60 per 1M	$2.00 / $0.16 per 1M	Input: TextInput: ImageInput: Document Output: Text
Grok 4.5 $		500K	$1.20 / $3.60 per 1M	$0.30 / $0.30 per 1M	Input: TextInput: Image Output: Text
Claude Sonnet 5 $		1M	$1.80 / $9.00 per 1M	$2.25 / $0.18 per 1M	Input: TextInput: Document Output: Text
Minimax M3 $		1.05M	$0.48 / $0.96 per 1M	$0.10 / $0.10 per 1M	Input: TextInput: ImageInput: Document Output: Text
GLM 5.2 $		1.05M	$1.26 / $3.96 per 1M	$0.23 / $0.23 per 1M	Input: TextInput: ImageInput: Document Output: Text
Claude Fable 5 $		1M	$9.00 / $45.00 per 1M	$11.25 / $0.90 per 1M	Input: TextInput: Document Output: Text
Qwen3.7 Max $		1M	$0.36 / $1.44 per 1M	$0.07 / $0.07 per 1M	Input: TextInput: Document Output: Text
Claude Opus 4.8 Thinking $		1M	$4.50 / $22.50 per 1M	$5.63 / $0.45 per 1M	Input: TextInput: Document Output: Text
Claude Opus 4.8 $		1M	$4.50 / $22.50 per 1M	$5.63 / $0.45 per 1M	Input: TextInput: Document Output: Text
DeepSeek v4 Flash $	—	1.05M	$0.30 / $1.20 per 1M	— / $0.006 per 1M	Input: Text Output: Text
Grok 4.3 $		1M	$0.75 / $1.50 per 1M	$0.12 / $0.12 per 1M	Input: TextInput: Image Output: Text
Kimi K2.6 $		262K	$0.85 / $3.60 per 1M	$0.14 / $0.14 per 1M	Input: TextInput: Document Output: Text
Minimax M2.5 $		205K	$0.24 / $0.96 per 1M	$0.30 / $0.02 per 1M	Input: TextInput: Document Output: Text
Kimi K2.5 $		262K	$0.54 / $2.70 per 1M	$0.09 / $0.09 per 1M	Input: TextInput: Document Output: Text
Doubao Seed 1.6 Thinking (Build 250715) $		262K	$0.10 / $0.97 per 1M	—	Input: TextInput: Image Output: Text
Doubao Seed 1.6 Thinking (Build 250615) $		262K	$0.10 / $0.97 per 1M	—	Input: TextInput: Image Output: Text
Doubao Seed 1.6 Flash (Build 250615) $		262K	$0.02 / $0.18 per 1M	—	Input: TextInput: Image Output: Text

Claude Opus 4.1 Key Capabilities

Experience the most advanced reasoning features available in the Claude Opus 4.1 thinking API, designed for high-precision enterprise tasks.

Elite Claude 4.1 Thinking and Logic

Claude 4.1 uses an internal reasoning budget to solve multi-step problems, reducing logical errors in scientific modeling with Claude precision.

SOTA Coding with Claude Opus 4.1 API

Achieve 96.2% on HumanEval. Claude Opus 4.1 resolves GitHub issues and identifies vulnerabilities in large-scale C++ or Rust codebases easily.

Massive 500k Context Claude Window

Analyze up to 500,000 tokens with perfect recall. Perfect for legal discovery or pharmaceutical research involving massive datasets and Claude documents.

Native Multimodal Claude API Support

Process images, PDFs, and video at 60fps. Claude Opus 4.1 performs temporal reasoning on visual data to explain failures or trends for Claude users.

Claude Opus 4.1 Thinking API FAQ

Find answers to common questions about the Claude Opus 4.1 thinking API, including performance, pricing, and how to integrate this model into your workflow.

How does the Claude Opus 4.1 thinking API work?

The Claude Opus 4.1 thinking API uses an internal reasoning budget to deliberate before finalizing an answer. This Claude active reasoning mode allows the model to verify its own logic and correct errors in real-time. By enabling the Claude thinking block in your API call, you allow Claude to process multi-step problems with a level of depth that standard Claude models cannot match, making it ideal for elite Claude coding and scientific synthesis.

What is the context window for Claude 4.1 Opus?

Claude Opus 4.1 features a massive 500,000-token context window. This expanded Claude capacity allows you to process entire codebases or long legal documents in a single request. Tests show near-perfect Claude information retrieval across the full range, ensuring that Claude never misses a detail in your data. This makes the 4.1 thinking API a powerful tool for large-scale Claude document analysis and complex Claude agentic workflows.

Is Claude Opus 4.1 better for coding than other models?

Yes, Claude Opus 4.1 is the industry leader for coding, scoring 96.2% on HumanEval. Its Claude thinking capabilities allow it to reason through inter-file dependencies and resolve complex Claude GitHub issues that trip up other models. When using the Claude API for software engineering, the model identifies subtle logic bombs and refactors legacy Claude modules for thread safety with professional-grade precision and Claude consistency.

What are the costs for the Claude 4.1 thinking API?

The Claude Opus 4.1 pricing is $15.00 per 1M input tokens and $75.00 per 1M output tokens. Tokens generated during the Claude thinking process are billed at the standard Claude output rate. While more expensive than 'mini' models, the high Claude reasoning density often reduces the number of iterations needed for complex projects, potentially lowering your total Claude spend on sophisticated AI tasks compared to using less capable models.

Does the thinking process increase Claude API latency?

Yes, because the Claude 4.1 thinking API takes time to deliberate, you will notice a higher Time-to-First-Token (TTFT) compared to non-reasoning Claude models. Typically, a 1024-token Claude thinking budget adds 2 to 5 seconds of latency. Consequently, Claude Opus 4.1 is best suited for offline tasks like Claude auditing or modeling where Claude accuracy is more important than immediate real-time responses, rather than simple Claude chat interfaces.

How do I integrate Claude 4.1 via GPTProto.com?

Integrating Claude Opus 4.1 via GPTProto.com is straightforward. We provide a unified, OpenAI-compatible Claude schema that lets you access the Claude thinking API with a single key. Our platform adds Claude value through multi-region failover and centralized Claude billing. To start, simply update your Claude model ID to the Opus 4.1 identifier and configure your Claude thinking token budget. We handle the Claude infrastructure for your team.

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Claude Opus 4.1 Key Capabilities

Elite Claude 4.1 Thinking and Logic

SOTA Coding with Claude Opus 4.1 API

Massive 500k Context Claude Window

Native Multimodal Claude API Support

How does the Claude Opus 4.1 thinking API work?

What is the context window for Claude 4.1 Opus?

Is Claude Opus 4.1 better for coding than other models?

What are the costs for the Claude 4.1 thinking API?

Does the thinking process increase Claude API latency?

How do I integrate Claude 4.1 via GPTProto.com?

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