ZMIME
Comparison · 3 models · Updated Oct 4, 2026

GPT-5.4 mini vs Grok 4.3 vs Inkling Small

Inkling Small comes out ahead, 70 to 67 and 63 on our weighted score, and it is the cheaper option too.

  1. OpenAI

    GPT-5.4 mini

    Released Mar 17, 2026

    63/100
    • ECI148.8
    • Price$0.75 / $4.50
    • Context400K
    Full specs Remove GPT-5.4 mini

  2. xAI

    Grok 4.3

    Released Apr 17, 2026

    67/100
    • ECI149.2
    • Price$1.25 / $2.50
    • Context1M
    Full specs Remove Grok 4.3
  3. Our pick

    Thinking Machines

    Inkling Small

    Released Jul 30, 2026

    70/100
    • ECI150.2
    • Price$0.50 / $1.20
    • Context1.05M
    Full specs Remove Inkling Small
01 — Verdict

Inkling Small is our pick

Inkling Small is the better all-round choice, scoring 70/100 against Grok 4.3 (67) and GPT-5.4 mini (63). It leads on price. Grok 4.3 wins on inputs & features. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityInkling SmallCapabilities Index (ECI): Inkling Small 150.2 · Grok 4.3 149.2 · GPT-5.4 mini 148.8
  • Lowest priceInkling SmallInkling Small $0.675 · Grok 4.3 $1.56 · GPT-5.4 mini $1.69 per 1M tokens (3:1 blend)
  • Longest contextInkling SmallInkling Small 1,048,576 · Grok 4.3 1,000,000 · GPT-5.4 mini 400,000 tokens
  • Widest inputsGrok 4.3 and Inkling SmallGPT-5.4 mini: Text, Images · Grok 4.3: Text, Images, PDFs · Inkling Small: Text, Images, Audio
  • Self-hostingInkling SmallPublishes downloadable weights (Apache-2.0)
How the score is built
MeasureWeightGPT-5.4 miniGrok 4.3Inkling Small
CapabilityCapabilities Index (ECI)50%777778
Price25%394158
Inputs & features15%708070
Context window10%446061
Overall100%63/10067/10070/100
02 — Side by side

Every spec in one table

Highlighted cells lead their row. Dashes mean the data is not published.

GPT-5.4 mini vs Grok 4.3 vs Inkling Small specifications side by side
SpecificationGPT-5.4 miniOpenAIGrok 4.3xAIInkling SmallThinking Machines
Capability
Capabilities Index (ECI)148.8149.2150.2 (best)
ECI rank#56 of 148#55 of 148#47 of 148 (best)
GPQA DiamondGraduate-level science questions86.9%88.8% (best)88.5%
FrontierMath Tiers 1–3Research-level mathematics51.2% (best)42.8%46.3%
OTIS Mock AIME 2024–2025Competition mathematics88.9%93.3% (best)90.0%
SimpleQA VerifiedShort factual questions29.4%33.2% (best)19.1%
Price per million tokens
Input$0.75$1.25$0.50 (best)
Output$4.50$2.50$1.20 (best)
Cached input$0.075 (best)$0.20—
Blended (3:1)$1.69$1.56$0.675 (best)
Long-context rateSame rateOver 200K: $2.50 / $5.00Same rate
Price sourceOfficial OpenAI APIOfficial xAI APIMedian of 11 providers
Limits
Context window400,000 tokens1,000,000 tokens1,048,576 tokens (best)
Max output128,000 tokens30,000 tokens1,048,576 tokens (best)
Inputs and features
TextYesYesYes
ImagesYesYesYes
PDFsNoYesNo
AudioNoNoYes
VideoNoNoNo
ReasoningYeslow · medium · high · xhighYeslow · medium · highYes
Tool callingYesYesYes
Structured outputYesYesNo
Availability
WeightsProprietaryProprietaryOpenApache-2.0
API model IDgpt-5.4-minigrok-4.3—
API providers29 (best)2711
ReleasedMar 17, 2026Apr 17, 2026Jul 30, 2026
Knowledge cutoffAug 31, 2025——
03 — Cost

What would a month cost?

Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.

  • GPT-5.4 mini$16.50
  • Grok 4.3$17.50
  • Inkling Small$7.40
04 — Questions

Which should you choose?

Which is better: GPT-5.4 mini, Grok 4.3 or Inkling Small?

Inkling Small is the better all-round choice, scoring 70/100 against Grok 4.3 (67) and GPT-5.4 mini (63). It leads on price. Grok 4.3 wins on inputs & features. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, GPT-5.4 mini, Grok 4.3 or Inkling Small?

Inkling Small is cheaper at $0.50 input / $1.20 output per million tokens (median across 11 API providers). Grok 4.3 costs $1.25 input / $2.50 output per million tokens (official xAI API price); GPT-5.4 mini costs $0.75 input / $4.50 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $0.675 per million tokens for Inkling Small versus $1.56 for Grok 4.3 (2.3× as much) and $1.69 for GPT-5.4 mini (2.5× as much).

Which scores higher on benchmarks?

Inkling Small scores higher on the Capabilities Index (ECI): Inkling Small 150.2 (#47 of 148), Grok 4.3 149.2 (#55 of 148) and GPT-5.4 mini 148.8 (#56 of 148). The confidence ranges of the top two overlap (147.5–152.1 vs 147.6–150.8), so treat the gap as small. On individual benchmarks: GPQA Diamond — Grok 4.3 88.8%, Inkling Small 88.5%, GPT-5.4 mini 86.9%; FrontierMath Tiers 1–3 — GPT-5.4 mini 51.2%, Inkling Small 46.3%, Grok 4.3 42.8%; OTIS Mock AIME 2024–2025 — Grok 4.3 93.3%, Inkling Small 90.0%, GPT-5.4 mini 88.9%; SimpleQA Verified — Grok 4.3 33.2%, GPT-5.4 mini 29.4%, Inkling Small 19.1%.

Which is better for coding?

There are no published SWE-bench Verified results for GPT-5.4 mini, Grok 4.3 and Inkling Small yet, so there is no like-for-like coding score. On overall capability, Inkling Small leads, which tends to carry over to coding, but test on your own codebase. All three support tool calling for agent workflows.

Which has the bigger context window?

Inkling Small has the largest context window at 1,048,576 tokens, against 1,000,000 for Grok 4.3 and 400,000 for GPT-5.4 mini. Maximum output per response: GPT-5.4 mini up to 128,000, Grok 4.3 up to 30,000, Inkling Small up to 1,048,576 tokens.

Which can read images, PDFs, audio or video?

GPT-5.4 mini accepts text and images; Grok 4.3 accepts text, images and PDFs; Inkling Small accepts text, images and audio. Grok 4.3 handles the widest range of inputs.

Are any of these open source?

Inkling Small publishes its weights (Apache-2.0) and can be self-hosted; GPT-5.4 mini and Grok 4.3 is proprietary.

Which is newer?

Inkling Small is the newest, released Jul 30, 2026. Grok 4.3 came out Apr 17, 2026; GPT-5.4 mini came out Mar 17, 2026. Knowledge cutoff: GPT-5.4 mini Aug 31, 2025.

How do you decide the winner?

Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.

05 — Keep comparing

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