API cost decision in 10 seconds

Inkling (batch) vs Claude Opus 4.8 (Fast)

Pick Inkling (batch) for lower cost; pick Claude Opus 4.8 (Fast) only if the larger context window matters more.

Page updated: 2026-08-18T20:08:16Z Data confirmed: 2026-08-23T13:07:49Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Inkling (batch) for lower cost; pick Claude Opus 4.8 (Fast) only if the larger context window matters more.

On the standard 1M input plus 500K output workload, Inkling (batch) is estimated at $3.02 vs $35 for Claude Opus 4.8 (Fast), saving $31.98 (91.4% lower).

Cost-first pickInkling (batch)

Context-first pickClaude Opus 4.8 (Fast)

Sample savings$31.9891.4%

10x traffic gap$319.75

Claude Opus 4.8 (Fast) has more context, but Inkling (batch) saves $31.98 on the standard workload. At 10x that traffic, the same price gap is about $319.75. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

Inkling (batch) stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shape	Token mix	Better pick	Inkling (batch)	Claude Opus 4.8 (Fast)
Input-heavy / RAG	5M input + 500K output	Inkling (batch)	$7.03	$75
Balanced workload	1M input + 1M output	Inkling (batch)	$5.05	$60
Output-heavy chatbot	1M input + 5M output	Inkling (batch)	$21.25	$260

Cheaper input Inkling (batch) $1 vs $10 / 1M

Inkling (batch) is $9 cheaper per 1M input tokens (90% lower; 10x difference).

Cheaper output Inkling (batch) $4.05 vs $50 / 1M

Inkling (batch) is $45.95 cheaper per 1M output tokens (91.9% lower; 12.3x difference).

Larger context Claude Opus 4.8 (Fast) 524.29K vs 1M

Claude Opus 4.8 (Fast) has 475.71K more context (1.91x larger).

Sample workload Inkling (batch) $3.02 vs $35

Inkling (batch) is $31.98 cheaper on the standard workload (91.4% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

Inkling (batch) Calculating… Estimated API cost

Claude Opus 4.8 (Fast) 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

Inkling (batch) has the lower input price; Inkling (batch) has the lower output price; Claude Opus 4.8 (Fast) offers the larger context window. For the 1M input plus 500K output sample, Inkling (batch) is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $3.02 for Inkling (batch) and $35 for Claude Opus 4.8 (Fast).

Best Fit

Choose Inkling (batch) when you care most about lower input-token price, and lower output-token price.

Choose Claude Opus 4.8 (Fast) when you care most about larger context window.

Decision Notes

On the standard 1M input plus 500K output workload, Inkling (batch) is estimated at $3.02 vs $35 for Claude Opus 4.8 (Fast), saving $31.98 (91.4% lower).
Inkling (batch) is $31.98 cheaper on the standard workload (91.4% lower).
Inkling (batch) is $9 cheaper per 1M input tokens (90% lower; 10x difference).
Inkling (batch) is $45.95 cheaper per 1M output tokens (91.9% lower; 12.3x difference).
Claude Opus 4.8 (Fast) has 475.71K more context (1.91x larger).

Head-to-Head Specs

Feature	Inkling (batch) (Thinking Machines)	Claude Opus 4.8 (Fast) (Anthropic)
Input Price prompt tokens per 1M	$1	$10
Completion Price per 1M tokens	$4.05	$50
Sample Workload Cost 1M input + 500K output	$3.02	$35
Context Window	524.29K	1M
Release Date	2026-07-17	2026-05-27

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	Inkling (batch)	On the standard 1M input plus 500K output workload, Inkling (batch) is estimated at $3.02 vs $35 for Claude Opus 4.8 (Fast), saving $31.98 (91.4% lower).
High-volume input processing	Inkling (batch)	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	Inkling (batch)	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	Claude Opus 4.8 (Fast)	A larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps

Inkling Small (free) can replace Inkling (batch) when lower sample workload cost matters most: $0.
Inkling (free) can replace Inkling (batch) when lower sample workload cost matters most: $0.
Inkling Small can replace Inkling (batch) when lower sample workload cost matters most: $1.05.
Claude 3 Haiku can replace Claude Opus 4.8 (Fast) when lower sample workload cost matters most: $0.88.

Larger context near this budget

Grok 4.20 Multi-Agent offers 2M context with $2.5 sample workload cost.
Grok 4.20 offers 2M context with $2.5 sample workload cost.
DeepSeek V4 Flash 0731 offers 1.31M context with $0.17 sample workload cost.
DeepSeek V4 Flash Latest offers 1.31M context with $0.11 sample workload cost.

Popular competitors

DeepSeek V4 Flash 0731 · DeepSeek · #1
MiMo-V2.5 · Xiaomi · #2
Hy3 · Tencent · #3
Ox Alpha · stealth · #4

Cheaper alternatives

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

Open cheapest models

Larger context alternatives

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

Open largest context models

Provider catalogs

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

Open provider hubs

Thinking Machines catalog

Review all tracked Thinking Machines models before deciding whether this matchup is the right shortlist.

Open Thinking Machines models

Anthropic catalog

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

Open Anthropic models

Inkling (batch)

Inkling is an open-weight multimodal mixture-of-experts model from Thinking Machines Lab, with 41B active parameters out of 975B total. It is designed for general-purpose reasoning, coding, agentic and tool-use systems,...

Claude Opus 4.8 (Fast)

Fast-mode variant of [Opus 4.8](/anthropic/claude-opus-4.8) - identical capabilities with higher output speed at 2x pricing relative to regular Opus 4.8. Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-mode