As of August 20, 2026, Inkling-Small is 73% cheaper per million tokens than o4-mini. Inkling-Small is $0.30 / $1.20 per million input/output tokens versus o4-mini at $1.10 / $4.40. Sources: https://thinkingmachines.ai and https://developers.openai.com/api/docs/pricing
Sources: Thinking Machines Lab pricing (https://thinkingmachines.ai); OpenAI API pricing (https://developers.openai.com/api/docs/pricing)
Inkling-Small
Thinking Machines
Input
$0.30
Output
$1.20
o4-mini
OpenAI
Input
$1.10
Output
$4.40
Token pricing, specs, and benchmarks side by side
Inkling-Smallo4-miniVerdict
Inkling-Small offers both lower pricing and stronger benchmark performance across the board, making it the clear value leader in this comparison.
As of August 20, 2026, Inkling-Small is 73% cheaper on blended LLM API pricing. Inkling-Small costs $0.30 per million input tokens and $1.20 per million output tokens ($1.50 blended 1M-in + 1M-out). o4-mini costs $1.10 / $4.40 per million tokens ($5.50 blended). Sources: https://thinkingmachines.ai and https://developers.openai.com/api/docs/pricing. The cheapest LLM for your app still depends on how many output tokens you generate.
Inkling-Small Thinking Machines Lab API pricing is $0.30 input and $1.20 output per million tokens via Thinking Machines Lab. o4-mini OpenAI API pricing is $1.10 input and $4.40 output per million tokens via OpenAI. Use those four numbers, not ChatGPT Plus or Claude Pro subscription prices, when you are comparing APIs.
Inkling-Small leads on SWE-bench Verified: Inkling-Small at 80.2% vs o4-mini at 68.1%. SWE-bench measures real GitHub fixes; LiveCodeBench measures contest programming.
Inkling-Small supports a 256K token context window, while o4-mini supports 200K tokens. Inkling-Small offers a larger context window. Filling a larger window bills more input tokens, so the cheaper-per-million model can still cost more on long documents.
Inkling-Small leads on 15 of 18 shared benchmarks versus o4-mini's 3 wins. Check the comparison table for GPQA Diamond, SWE-bench, MMLU, HLE, and the other evals we track. Token price and benchmark score together are the usual LLM comparison, not either number alone.
Both Inkling-Small and o4-mini are production API models. For cost-sensitive production traffic, Inkling-Small has better economics on the blended 1M-in + 1M-out scale. For maximum capability, weight the benchmark table for your domain. Many production stacks route cheap models for drafts and a frontier model for the hard turn, which is usually cheaper than sending everything to the expensive API.
Yes. Call Inkling-Small through Thinking Machines Lab and o4-mini through OpenAI with separate API keys, or through a gateway that already wraps both. Keep prompts in tokens, not characters, when you estimate the invoice. AnotherWrapper templates can swap providers without rewriting auth and billing.
List rates are the latest published Thinking Machines Lab API pricing and OpenAI API pricing, quoted per million tokens. Official rate sheets: https://thinkingmachines.ai and https://developers.openai.com/api/docs/pricing. Prompt caching, batch APIs, and committed-use discounts can change the invoice. Benchmark scores are from official publications and independent evals, updated as new numbers land.
Inkling-Small supports up to 256K output tokens per request, while o4-mini supports up to 100K output tokens. Output tokens are usually the expensive half of API pricing, so a higher max output cap is a capability, not a discount.
o4-mini has a measured throughput of approximately 115 tokens/second. Throughput data for Inkling-Small is not yet available. Throughput (tokens per second) and time-to-first-token are why two models with the same per-million-token price can still feel different in chat and agents.
Use the model pickers at the top of this LLM comparison. Search any model in the index and the URL updates. Open Inkling-Small or o4-mini from the sidebar for the single-model API pricing page, or go back to the LLM pricing table to sort by cheapest blended cost.
This comparison covers API pricing, context window, throughput, and benchmark scores. Inkling-Small costs $0.30/M input and $1.20/M output via Thinking Machines Lab. o4-mini costs $1.10/M input and $4.40/M output.
Rank both on the LLM leaderboard, SWE-bench, and Humanity's Last Exam.
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