How much lower on DeepSeek?

On the same V4 Pro model, QuickSilver Pro is $0.70 / $2.10 per 1M tokens versus Fireworks' current $1.74/$3.48 rate — about 60% lower on input and 40% lower on output. The official V4 Flash 0731 build is $0.06 / $0.18 versus Fireworks' $0.14/$0.28, about 57% lower on input and 36% lower on output.

Two lines: change base_url to api.quicksilverpro.io/v1 and swap the API key. Model ID mappings: accounts/fireworks/models/deepseek-v4-pro -> deepseek-v4-pro.

Is latency comparable?

Within 10% on p50 for the V4 wave and Qwen. Live per-model latency is at quicksilverpro.io/status.

Do you support FireFunction V2?

No. FireFunction V2 is Fireworks' proprietary fine-tuned model; it is not in the QuickSilver Pro catalog. For tool calling, DeepSeek V4 Flash and Qwen3.6-35B-A3B both support the OpenAI tools / function calling API.

Comparison

QuickSilver Pro vs Fireworks AI

Fireworks AI runs its own GPU fleet and sets premium prices for DeepSeek. QuickSilver Pro serves the latest DeepSeek V4 wave — V4 Flash at $0.06 / $0.18 for low-cost chat and V4 Pro at $0.70 / $2.10 for premium reasoning — well below Fireworks' rates. Same OpenAI-compatible surface, two-line migration.

At a glance

Feature	QuickSilver Pro	Fireworks AI
Catalog focus	Curated frontier + open models; 45 accept image input	Fireworks AIMany open models + vision + fine-tuning
DeepSeek V4 Pro output	$2.10 / 1M	$3.48 / 1M
Official V4 Flash 0731	$0.06 / $0.18	$0.14 / $0.28
Fine-tuning / deployments	No	Yes
FireFunction V2 (tool calling model)	No	Yes
Audio models	No	Yes
Image generation	Nano Banana Pro (Gemini 3 Pro Image), Nano Banana 2.1, FLUX.2 Pro, FLUX.1 Schnell, SDXL Turbo, FLUX.2 Klein, Qwen Image 3.0, Seedream 5.0 Pro, Seedream 4, Bria FIBO 1.5, Bria FIBO 2.0, GPT Image 2, GPT Image 2.5 Flare and GPT Image 2.5 Sunburst	Yes
OpenAI-compatible chat	Yes	Yes
Minimum top-up	$5	Varies

Pricing (per million tokens, USD)

Competitor list prices, last checked 2026-08-12.

Model	QSP input	QSP output	Fireworks AI input	Fireworks AI output	vs. list	QSP vs Fireworks AI (Fireworks) · in / out
DeepSeek V4 Flash 0731	$0.06	$0.18	$0.14	$0.28	compare token rates	QSP $0.06 / $0.18	Fireworks $0.14 / $0.28
DeepSeek V4 Pro	$0.70	$2.10	$1.74	$3.48	~40% output	QSP $0.70 / $2.10	Fireworks $1.74 / $3.48
Qwen3.6-35B-A3B	$0.05	$0.70	Comparable	Comparable	—	QSP $0.05 / $0.70	Fireworks Comparable / Comparable

QSP columns come from the live catalog at build time; Fireworks AI columns are the published rates read on the date above.

Migration - two lines

Full migration guide

Before · Fireworks AI

import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.fireworks.ai/inference/v1",
    api_key=os.environ["FIREWORKS_API_KEY"],
)

r = client.chat.completions.create(
    model="accounts/fireworks/models/deepseek-v4-pro",
    messages=[{"role": "user", "content": "Hi"}],
)

After - QuickSilver Pro

import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.quicksilverpro.io/v1",
    api_key=os.environ["QSP_KEY"],
)

r = client.chat.completions.create(
    model="deepseek-v4-pro",
    messages=[{"role": "user", "content": "Hi"}],
)

The two changed lines are marked. Model IDs also change — see the 1 mapping in the guide.

FAQ

Start with your own key

Change two lines. Compare current per-token prices before your first call.

Get API Key