2026 年高端大模型的旗舰之争已经进入"流式首 token 延迟决定体验"的阶段。我最近一周把 GPT-5.5、Claude Opus 4.7、DeepSeek V4 三款模型统一接入到 HolySheep AI 兼容网关做压测,目标只有一个:在每天 500 万 token 的批量文本生成管道里,谁能在流式吞吐、首 token 延迟、价格三个维度上做到综合最优。本文既是横评报告,也是从官方 API 或其他中转迁移到 HolySheep 的工程决策手册。

一、测试环境与方法

二、三模型流式吞吐与延迟实测数据

指标GPT-5.5Claude Opus 4.7DeepSeek V4
首 token 延迟 TTFT (P50)180 ms260 ms95 ms
首 token 延迟 TTFT (P95)420 ms680 ms210 ms
持续吐 token 速率118 tok/s92 tok/s165 tok/s
60s 并发吞吐(单 Key)4.2 万 tok3.1 万 tok6.8 万 tok
30 分钟请求成功率99.7 %99.4 %99.9 %
流式中途断流率0.12 %0.31 %0.05 %

数据来源:HolySheep 实测,2026-Q1,同机房同窗口对比;样本量:每模型 40 轮 × 16 并发 = 640 次请求。

实测一句话总结:DeepSeek V4 在延迟与吞吐两端同时领先,TTFT 仅 95 ms;Opus 4.7 在长上下文创意写作里质量最稳,但代价是 680 ms 的 P95;GPT-5.5 处于均衡中位。下面我把压测脚本贴出来,所有读者都可以直接复现。

# 文件:bench_stream.py

用途:同时压测 GPT-5.5 / Claude Opus 4.7 / DeepSeek V4 的流式吞吐

import asyncio, time, httpx, json, statistics BASE = "https://api.holysheep.ai/v1" KEY = "YOUR_HOLYSHEEP_API_KEY" # https://www.holysheep.ai/register 注册即送 MODELS = ["gpt-5.5", "claude-opus-4.7", "deepseek-v4"] PROMPT = "请用 800 字解释 Python asyncio 取消语义与 finally 块的协作机制。" * 4 # ≈600 tokens async def stream_once(client, model): url = f"{BASE}/chat/completions" headers = {"Authorization": f"Bearer {KEY}"} body = { "model": model, "messages": [{"role": "user", "content": PROMPT}], "max_tokens": 1024, "temperature": 0.7, "stream": True, } t0 = time.perf_counter() first_t = None toks = 0 async with client.stream("POST", url, headers=headers, json=body, timeout=60) as r: r.raise_for_status() async for line in r.aiter_lines(): if not line or line == "data: [DONE]": continue if line.startswith("data: "): if first_t is None: first_t = time.perf_counter() - t0 payload = json.loads(line[6:]) if payload["choices"][0]["delta"].get("content"): toks += 1 total = time.perf_counter() - t0 return {"ttft": first_t, "total": total, "toks": toks} async def bench(model, concurrency=16, rounds=40): async with httpx.AsyncClient() as client: sem = asyncio.Semaphore(concurrency) async def one(): async with sem: try: return await stream_once(client, model) except Exception as e: return {"err": str(e)} return await asyncio.gather(*[one() for _ in range(rounds)]) if __name__ == "__main__": for m in MODELS: rows = asyncio.run(bench(m)) ok = [r for r in rows if