API cost decision in 10 seconds

Seed 1.6 vs GPT-5.1 Chat

Pick Seed 1.6 when budget and context both matter.

Page updated: 2026-05-26T10:03:26Z Data confirmed: 2026-05-26T12:43:06Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Seed 1.6 when budget and context both matter.

On the standard 1M input plus 500K output workload, Seed 1.6 is estimated at $1.25 vs $6.25 for GPT-5.1 Chat, saving $5 (80% lower).

Cost-first pickSeed 1.6

Context-first pickSeed 1.6

Sample savings$580%

10x traffic gap$50

Seed 1.6 is cheaper on the standard workload and also has the larger context window. At 10x that traffic, the same price gap is about $50. 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 stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shape	Token mix	Better pick	Seed 1.6	GPT-5.1 Chat
Input-heavy / RAG	5M input + 500K output	Seed 1.6	$2.25	$11.25
Balanced workload	1M input + 1M output	Seed 1.6	$2.25	$11.25
Output-heavy chatbot	1M input + 5M output	Seed 1.6	$10.25	$51.25

Cheaper input Seed 1.6 $0.25 vs $1.25 / 1M

Seed 1.6 is $1 cheaper per 1M input tokens (80% lower; 5x difference).

Cheaper output Seed 1.6 $2 vs $10 / 1M

Seed 1.6 is $8 cheaper per 1M output tokens (80% lower; 5x difference).

Larger context Seed 1.6 262.14K vs 128K

Seed 1.6 has 134.14K more context (2.05x larger).

Sample workload Seed 1.6 $1.25 vs $6.25

Seed 1.6 is $5 cheaper on the standard workload (80% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

Seed 1.6 Calculating… Estimated API cost

GPT-5.1 Chat 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 has the lower input price; Seed 1.6 has the lower output price; Seed 1.6 offers the larger context window. For the 1M input plus 500K output sample, Seed 1.6 is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $1.25 for Seed 1.6 and $6.25 for GPT-5.1 Chat.

Best Fit

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

Choose GPT-5.1 Chat when its provider, model quality, latency, or availability is more important than the numeric price/context winner.

Decision Notes

On the standard 1M input plus 500K output workload, Seed 1.6 is estimated at $1.25 vs $6.25 for GPT-5.1 Chat, saving $5 (80% lower).
Seed 1.6 is $5 cheaper on the standard workload (80% lower).
Seed 1.6 is $1 cheaper per 1M input tokens (80% lower; 5x difference).
Seed 1.6 is $8 cheaper per 1M output tokens (80% lower; 5x difference).
Seed 1.6 has 134.14K more context (2.05x larger).

Head-to-Head Specs

Feature	Seed 1.6 (ByteDance Seed)	GPT-5.1 Chat (OpenAI)
Input Price prompt tokens per 1M	$0.25	$1.25
Completion Price per 1M tokens	$2	$10
Sample Workload Cost 1M input + 500K output	$1.25	$6.25
Context Window	262.14K	128K
Release Date	2025-12-23	2025-11-13

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	Seed 1.6	On the standard 1M input plus 500K output workload, Seed 1.6 is estimated at $1.25 vs $6.25 for GPT-5.1 Chat, saving $5 (80% lower).
High-volume input processing	Seed 1.6	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	Seed 1.6	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	Seed 1.6	A larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps

Seed 1.6 Flash can replace Seed 1.6 when lower sample workload cost matters most: $0.22.
Seed-2.0-Mini can replace Seed 1.6 when lower sample workload cost matters most: $0.3.
gpt-oss-120b (free) can replace GPT-5.1 Chat when lower sample workload cost matters most: $0.
gpt-oss-20b (free) can replace GPT-5.1 Chat when lower sample workload cost matters most: $0.

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.
Owl Alpha offers 1.05M context with $0 sample workload cost.

Popular competitors

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Claude Sonnet 4.6 · Anthropic · #4

Cheaper alternatives

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Larger context alternatives

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Provider catalogs

Compare models within provider hubs before choosing a final API vendor.

Open provider hubs

ByteDance Seed catalog

Review all tracked ByteDance Seed models before deciding whether this matchup is the right shortlist.

Open ByteDance Seed models

OpenAI catalog

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

Open OpenAI models

Seed 1.6

Seed 1.6 is a general-purpose model released by the ByteDance Seed team. It incorporates multimodal capabilities and adaptive deep thinking with a 256K context window.

GPT-5.1 Chat

GPT-5.1 Chat (AKA Instant is the fast, lightweight member of the 5.1 family, optimized for low-latency chat while retaining strong general intelligence. It uses adaptive reasoning to selectively “think” on...