API cost decision in 10 seconds

GPT-5.4 Pro vs Seed 1.6 Flash

Pick Seed 1.6 Flash for lower cost; pick GPT-5.4 Pro only if the larger context window matters more.

Pricing data updated: 2026-05-26T11:08:00Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Seed 1.6 Flash for lower cost; pick GPT-5.4 Pro only if the larger context window matters more.

On the standard 1M input plus 500K output workload, Seed 1.6 Flash is estimated at $0.22 vs $120 for GPT-5.4 Pro, saving $119.78 (99.8% lower).

Cost-first pickSeed 1.6 Flash

Context-first pickGPT-5.4 Pro

Sample savings$119.7899.8%

10x traffic gap$1197.75

GPT-5.4 Pro has more context, but Seed 1.6 Flash saves $119.78 on the standard workload. At 10x that traffic, the same price gap is about $1197.75. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

Seed 1.6 Flash stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shape	Token mix	Better pick	GPT-5.4 Pro	Seed 1.6 Flash
Input-heavy / RAG	5M input + 500K output	Seed 1.6 Flash	$240	$0.53
Balanced workload	1M input + 1M output	Seed 1.6 Flash	$210	$0.38
Output-heavy chatbot	1M input + 5M output	Seed 1.6 Flash	$930	$1.57

Cheaper input Seed 1.6 Flash $30 vs $0.075 / 1M

Seed 1.6 Flash is $29.93 cheaper per 1M input tokens (99.8% lower; 400x difference).

Cheaper output Seed 1.6 Flash $180 vs $0.3 / 1M

Seed 1.6 Flash is $179.7 cheaper per 1M output tokens (99.8% lower; 600x difference).

Larger context GPT-5.4 Pro 1.05M vs 262.14K

GPT-5.4 Pro has 787.86K more context (4.01x larger).

Sample workload Seed 1.6 Flash $120 vs $0.22

Seed 1.6 Flash is $119.78 cheaper on the standard workload (99.8% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

GPT-5.4 Pro Calculating… Estimated API cost

Seed 1.6 Flash Calculating… Estimated API cost

Cheaper for this workload Calculating… Difference: calculating…

This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.

Quick Decision

Verdict

Seed 1.6 Flash has the lower input price; Seed 1.6 Flash has the lower output price; GPT-5.4 Pro offers the larger context window. For the 1M input plus 500K output sample, Seed 1.6 Flash is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $120 for GPT-5.4 Pro and $0.22 for Seed 1.6 Flash.

Best Fit

Choose GPT-5.4 Pro when you care most about larger context window.

Choose Seed 1.6 Flash when you care most about lower input-token price, and lower output-token price.

Decision Notes

On the standard 1M input plus 500K output workload, Seed 1.6 Flash is estimated at $0.22 vs $120 for GPT-5.4 Pro, saving $119.78 (99.8% lower).
Seed 1.6 Flash is $119.78 cheaper on the standard workload (99.8% lower).
Seed 1.6 Flash is $29.93 cheaper per 1M input tokens (99.8% lower; 400x difference).
Seed 1.6 Flash is $179.7 cheaper per 1M output tokens (99.8% lower; 600x difference).
GPT-5.4 Pro has 787.86K more context (4.01x larger).

Head-to-Head Specs

Feature	GPT-5.4 Pro (OpenAI)	Seed 1.6 Flash (ByteDance Seed)
Input Price prompt tokens per 1M	$30	$0.075
Completion Price per 1M tokens	$180	$0.3
Sample Workload Cost 1M input + 500K output	$120	$0.22
Context Window	1.05M	262.14K
Release Date	2026-03-05	2025-12-23

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	Seed 1.6 Flash	On the standard 1M input plus 500K output workload, Seed 1.6 Flash is estimated at $0.22 vs $120 for GPT-5.4 Pro, saving $119.78 (99.8% lower).
High-volume input processing	Seed 1.6 Flash	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	Seed 1.6 Flash	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	GPT-5.4 Pro	A larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps

gpt-oss-120b (free) can replace GPT-5.4 Pro when lower sample workload cost matters most: $0.
gpt-oss-20b (free) can replace GPT-5.4 Pro when lower sample workload cost matters most: $0.
gpt-oss-20b can replace GPT-5.4 Pro when lower sample workload cost matters most: $0.1.
gpt-oss-120b can replace GPT-5.4 Pro when lower sample workload cost matters most: $0.13.

Larger context near this budget

Llama 4 Scout offers 10M context with $0.23 sample workload cost.
Grok 4.20 Multi-Agent offers 2M context with $5 sample workload cost.
Grok 4.20 offers 2M context with $2.5 sample workload cost.

Popular competitors

No popular competitor is currently available.

Cheaper alternatives

Review low-cost models sorted by a standard 1M input plus 500K output workload.

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Larger context alternatives

Find models with larger context windows for RAG, long documents, and codebase review.

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Provider catalogs

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OpenAI catalog

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ByteDance Seed catalog

Check other ByteDance Seed models with comparable pricing, context, or release timing.

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GPT-5.4 Pro

GPT-5.4 Pro is OpenAI's most advanced model, building on GPT-5.4's unified architecture with enhanced reasoning capabilities for complex, high-stakes tasks. It features a 1M+ token context window (922K input, 128K...

Seed 1.6 Flash

Seed 1.6 Flash is an ultra-fast multimodal deep thinking model by ByteDance Seed, supporting both text and visual understanding. It features a 256k context window and can generate outputs of...