🔍 Why Choose ccglass · AI API Request Insight Analyzer?

ccglassIt is an online tool designed for AI engineers and prompt engineers,for API request debugging and Token cost analysis.It supportsAnthropic Messages API,OpenAI Chat CompletionsandOpenAI Responses APIthree mainstream formats, helping developers directly parse, preview, and optimize request content sent to large language models within the browser.

🚀 Core Application Scenarios in 2026

• Prompt Engineering Debugging: Quickly verify if the System Prompt is correctly injected, if Tool Definitions are complete, and if message history is arranged as expected, avoiding abnormal model behavior due to formatting errors.
• Token Consumption & Cost Calculation: PerformToken estimationon any request body, and combine it with the latest public pricing for models like Claude Sonnet / Opus / Haiku, GPT-4o / o3 / mini to calculate theUSD cost per requestin real-time, helping teams control API spending.
• Request Comparison (Diff): Compare two requests side-by-side, highlighting added, removed, and unchanged context blocks to clearly pinpoint changes in the context window—this is the most direct method for troubleshootingcontext leakageortool call loops.
• Streaming Response Reconstruction: Supports reconstructing SSE (Server-Sent Events) streaming response fragments into a completecontentlist, and restoring theinputparameters of tool_use, making it easy to verify the model's multi-step reasoning path.

⚙️ Underlying Algorithm Principles

The core of this tool is aformat-agnostic request view abstraction layer: Regardless of whether the input is Anthropic'smessages[]structure or OpenAI'sinput[]structure, the engine normalizes it into a{ system, messages, tools }three-part view. Token estimation uses a hybrid strategy—CJK characters count as 1.5 tokens, Latin characters count as 0.25 tokens, and the JSON Schema length of tool descriptions is added. Cost calculation matches the model name to the corresponding price table (e.g., Claude Opus at $15 USD per million input tokens, $75 USD per million output tokens), combined with theusagefield returned in the response to derive the exact value. Streaming response reconstruction parses SSEdata:events line by line, mergingtext_delta、thinking_delta, andinput_json_delta, ultimately restoring the complete message content.

❓ Frequently Asked Questions (FAQ)

Q: Will my API Key be uploaded?
A: No. All data is processed locally in the browser and is not sent to any server. You can safely paste requests containing Authorization headers.

Q: Which models are supported for price calculation?
A: Currently includes built-in price tables for mainstream models such as Claude Opus / Sonnet / Haiku, GPT-4o / 4.1 / o3 / mini / Codex, DeepSeek V4 Flash / Pro, and will be updated with official price changes.

Q: Why didn't my streaming response parse out tool_use?
A: Please ensure the SSE data includescontent_block_startandinput_json_deltaevents. If the response is a complete JSON (non-streaming), the tool also supports parsing it.

Q: What is the principle behind the Diff feature?
A: The context blocks of two requests are extracted into{ kind, text }lists respectively, compared using SHA-1 hashing to mark added, removed, and unchanged blocks, and displayed with color coding.

🏆 3 Key Advantages Over Similar Software

• Zero Deployment, Pure Frontend: No need to install Node.js or set up a backend; a single HTML file runs directly in the browser, suitable for quick debugging and offline use.
• Multi-Format Unified View: Compatible with both Anthropic and OpenAI request structures, providing consistent tabs (Overview / Message Flow / System / Tools / Response) with a very low learning curve.
• In-Depth Cost Analysis: Not only displays token counts but also calculates USD costs based on precise model unit prices, distinguishing between cache hit and miss costs to help teams optimize Prompt design and reduce spending.

ccglass · AI API Request Insight Analyzer v1.0 · Independently built based on the core concepts of the open-source project ccglass (Claude Code Wire Inspector).