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Gemini 3.8 Flash vs GPT-6 Luna

vs

何时用哪一个

两者涵盖的范围大致相同:约一百万 token 的上下文,以及聊天、视觉、代码、工具和推理,因此区别主要在于输入和价格。当您需要音频或视频输入时请选择 gemini-3.8-flash,因为 gpt-6-luna 仅接受文本和图像;对于大批量的文本和图像工作,请选择 gpt-6-luna,其 $0.1 的输入、$0.5 的输出和 $0.01 的缓存读取费率比 Gemini 的 $0.75、$3.75 和 $0.075 低约 7.5 倍,具有 128000 最大输出 token(对比 65536),并且可以选择关闭思考。

Benchmark 成绩

高于同侪均值无人分数更高Gemini 3.8 Flash12 / 175 / 17GPT-6 Luna仅 1 项可比
Gemini 3.8 Flash GPT-6 Luna 其他被测模型 同侪均值 无人分数更高
DeepSWE 1.1
73.7%
66.6%
BioMysteryBench hard
无人分数更高 56.5%
N/A
OSWorld 2.0 Partial score, batch tool enabled
59%
N/A
HealthBench Professional
52.1%
N/A
Finance Agent v2
无人分数更高 61.4%
N/A
Legal Agent Benchmark
10%
N/A
GPQA Diamond
95.3%
N/A
CharXiv (RQ) no tools
无人分数更高 86.2%
N/A

厂商公布: Alibaba (Qwen) Anthropic ByteDance DeepSeek Google MiniMax Moonshot OpenAI Tencent Z.ai

定价

Gemini 3.8 Flash GPT-6 Luna Δ
输入 / 1M tokens $0.75 $0.1 7.5×
输出 / 1M tokens $3.75 $0.5 7.5×
缓存读取 / 1M tokens $0.075 $0.01 7.5×
缓存写入 - 不单独收费 -

费率取自构建时的实时目录;每个模型页面均附有当前的费率卡。

它们的位置 — 以该计费单位计费的所有 74 个 聊天 模型的 每 1M token 的输入价格(对数刻度)

Gemini 3.8 Flash · $0.75 GPT-6 Luna · $0.1
$0.05 · Qwen3 VL Flash $30 · GPT-5.4 Pro

能力

Gemini 3.8 Flash GPT-6 Luna
工具使用
思考控制 是 —— 厂商未公布调节参数 可配置
结构化输出
提示词缓存 隐式 + 显式 隐式(自动)
缓存生存时间 未公开 5-10m, up to 1h
最小缓存前缀 4096 个 token 1024 个 token

规格

Gemini 3.8 Flash GPT-6 Luna
输入模态 文本 图像 音频 视频 文本 图像
输出模态 文本 文本
发布日期 2026-09-02 2026-09-22
知识截止日期 2026-03 2026-05
上下文窗口 1M 1.1M
最大输出 66K 128K
思考参数 - reasoning.effort
允许的值 -
reasoning.effort
  • none
  • low
  • medium
  • high
  • xhigh
  • max
默认值 - medium

规格转录自各供应商的文档;若供应商未发布某项数据,则直接省略该行,而非进行推断。 完整来源: Gemini 3.8 Flash · GPT-6 Luna

单个 Prompt,两个模型 —— 通过网关实测

提示词 Explain to a CFO, in exactly three sentences, why our LLM bill doubled after we enabled reasoning. 检查 恰好 3 句

Gemini 3.8 Flash 通过 · 3 sentences

When we enabled reasoning, the model began generating hidden "thinking tokens" to work through logic step-by-step before producing a final answer. Because AI vendors bill for every single token processed—visible or not—this internal deliberation dramatically inflated our billable volume per query. In short, while our total number of user requests remained flat, the cost per transaction doubled to buy higher accuracy on complex tasks.

输出 705 tok (+624 思考) 延迟 6.4 s

GPT-6 Luna 通过 · 3 sentences

Enabling reasoning typically makes the model process more information and generate more internal tokens before producing its answer. Because usage is billed by tokens—and reasoning may also route requests to a more expensive model—the cost per request can rise sharply. If request volume stayed similar, that higher cost per request could explain why the bill doubled.

输出 117 tok (+48 思考) 延迟 3.4 s

指令遵循(恰好三句,可数)、受众适配(面向 CFO 的语气),以及下方 token 计量所暴露的隐藏思考计费缺口。

提示词 This function is supposed to return the longest run of consecutive equal items, but callers report it is off by one on single-element inputs and misses runs that end at the last index. Fix it and explain the bug in one paragraph. 检查 修复通过测试

Gemini 3.8 Flash 通过 · 8/8 cases

Here is the corrected function: ```python def longest_run(xs): if not xs: return 0 best = 1 cur = 1 for i in range(1, len(xs)): if xs[i] == xs[i - 1]: cur += 1 best = max(best, cur) else: cur = 1 return best ``` ### Explanation of the Bug The original function counted equal-neighbor transitions rather than the actual items making up each run. Because `cur` started at `0` (and was reset to `0` on mismatches), every run was undercounted by one: single-element lists returned `0` because the loop never executed, and any subsequent run—including those ending at the last index—recorded a count of $N - 1$ instead of $N$. The fix handles empty input upfront, initializes both `cur` and `best` to `1` (since any single element forms a run of length 1), and resets `cur` to `1` whenever a new run begins.

输出 1393 tok (+1149 思考) 延迟 10.1 s

GPT-6 Luna 通过 · 8/8 cases

```python def longest_run(xs): if not xs: return 0 best = cur = 1 for i in range(1, len(xs)): if xs[i] == xs[i - 1]: cur += 1 else: cur = 1 best = max(best, cur) return best ``` The original code counted matching *adjacent pairs* rather than items, so a run of length `n` was reported as `n - 1`, and a single-item input returned `0`. This version counts the current item as part of each run and updates `best` at every index, including the last; it returns `0` for an empty input.

输出 514 tok (+356 思考) 延迟 6.9 s

修复是否真的正确(可运行)、解释的信息密度,以及在一个边界明确的任务上的 token 效率。

提示词 Extract a JSON object with fields {company, quarter, revenue_usd_m, growth_pct, guidance} from this text. Use null for anything not stated; add no other fields. 检查 合法 JSON,schema 精确

Gemini 3.8 Flash 通过 · 5/5 fields, guidance null

```json { "company": "Meridian Robotics", "quarter": "September quarter", "revenue_usd_m": 412, "growth_pct": null, "guidance": null } ```

输出 3989 tok (+3932 思考) 延迟 30.4 s

GPT-6 Luna 通过 · 5/5 fields, guidance "Withheld pending the Q4 close"

{"company":"Meridian Robotics","quarter":"September quarter","revenue_usd_m":412,"growth_pct":null,"guidance":"Withheld pending the Q4 close"}

输出 161 tok (+119 思考) 延迟 21.7 s

schema 服从度(不臆造字段)、幻觉压力(guidance 明确被暂缓给出),以及结构化输出路径的差异。

提示词 Write a 120-word product announcement for an API gateway feature that caches prompts across providers. Forbidden words: "seamless", "unlock", "game-changer", "revolutionize", "empower". Exactly one sentence must be a question. 检查 120 词,0 个禁用词

Gemini 3.8 Flash 通过 · 120 words, 0 banned, 1 question

Why pay multiple model providers for the exact same output? Introducing Universal Prompt Cache, our latest API gateway capability engineered to cut compute expenses and drop inference latency. When your application makes a call, the gateway inspects a central memory layer before routing traffic to external LLMs. If an identical query was previously processed by OpenAI, Anthropic, or Mistral, our gateway returns that response immediately. This shared cache eliminates duplicate token fees and insulates your production apps from vendor rate limits or unexpected downtime. Developers can easily customize expiration settings, enforce strict data privacy controls, and configure invalidation logic across every endpoint. Stop wasting your budget on repeated queries. Enable prompt caching in your dashboard to accelerate your pipeline today.

输出 3833 tok (+3688 思考) 延迟 21.8 s

GPT-6 Luna 通过 · 120 words, 0 banned, 1 question

Introducing Prompt Cache, a new API gateway feature that recognizes repeat prompt prefixes and reuses provider-side cached context across supported models. Teams can route requests to different AI providers while preserving eligible cache hits, reducing redundant input processing and helping lower latency and token costs. Configure cache policies in one place, monitor hit rates by provider, and keep existing client integrations unchanged. The gateway applies provider-specific rules automatically, so developers do not need to build separate caching logic for each endpoint. Which workflows could benefit from faster responses and predictable spend? Prompt Cache is available today in preview for eligible accounts, with usage details, supported providers, and setup guidance in the dashboard. Start with one route, compare results, then expand.

输出 959 tok (+813 思考) 延迟 14.6 s

约束服从度(字数预算、禁用词表、唯一的那句问句)、文风指纹,以及长度控制。

只需一行代码即可在它们之间切换

两个 ID 都包含在下方的每个选项卡中 — 高亮显示的两行是唯一的修改。相同的端点,相同的密钥,相同的请求结构。

from openai import OpenAI

client = OpenAI(
    base_url="https://synthorai.io/v1",
    api_key="sk-syn-...",
)

resp = client.chat.completions.create(
    model="gemini-3.8-flash",
    # model="gpt-6-luna",  # 取消注释此行,注释上一行
    messages=[{"role": "user", "content": "Summarize this diff"}],
    reasoning_effort="medium",
)
print(resp.choices[0].message.content)

获取 API 密钥 →

常见问题

Gemini 3.8 Flash 和 GPT-6 Luna 哪个更便宜?

在 输入 / 1m tokens 方面,GPT-6 Luna 更便宜($0.1 对比 $0.75,相差 7.5×)。其他行可能得出相反的结论——上方表格提供了完整信息,实际成本取决于你的组合使用情况。

我可以在不进行两次集成的情况下,对 Gemini 3.8 Flash 和 GPT-6 Luna 进行 A/B 测试吗?

可以。两者均通过同一个兼容 OpenAI 的端点提供服务,并使用同一把 API 密钥——切换只需更改一行模型字符串,因此你可以将一部分流量路由到各个模型并直接比较账单。

Gemini 3.8 Flash 和 GPT-6 Luna 支持提示词缓存吗?

是的 —— 两者对缓存读取的计费均低于其输入费率,因此热前缀工作负载的成本低于标价。准确的缓存读取行位于上方的定价表中。

相关对比

来自我们的实测研究