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Comparison · 3 models · Updated Oct 4, 2026

Grok 4.3 vs Claude Opus 4.5 vs GPT-5.4 mini

Grok 4.3 comes out ahead, 67 to 63 and 55 on our weighted score, and it is the cheaper option too.

  1. Our pick

    xAI

    Grok 4.3

    Released Apr 17, 2026

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

  2. Anthropic

    Claude Opus 4.5

    Released Nov 24, 2025

    55/100
    • ECI150.1
    • Price$5.00 / $25.00
    • Context200K
    Full specs Remove Claude Opus 4.5

  3. 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
01 — Verdict

Grok 4.3 is our pick

Grok 4.3 is the better all-round choice, scoring 67/100 against GPT-5.4 mini (63) and Claude Opus 4.5 (55). It leads on context window. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityClaude Opus 4.5Capabilities Index (ECI): Claude Opus 4.5 150.1 · Grok 4.3 149.2 · GPT-5.4 mini 148.8
  • Lowest priceGrok 4.3Grok 4.3 $1.56 · GPT-5.4 mini $1.69 · Claude Opus 4.5 $10.00 per 1M tokens (3:1 blend)
  • Longest contextGrok 4.3Grok 4.3 1,000,000 · GPT-5.4 mini 400,000 · Claude Opus 4.5 200,000 tokens
  • Widest inputsGrok 4.3 and Claude Opus 4.5Grok 4.3: Text, Images, PDFs · Claude Opus 4.5: Text, Images, PDFs · GPT-5.4 mini: Text, Images
  • Self-hostingNo open weightsAll three are available only through APIs
How the score is built
MeasureWeightGrok 4.3Claude Opus 4.5GPT-5.4 mini
CapabilityCapabilities Index (ECI)50%777877
Price25%41239
Inputs & features15%808070
Context window10%603244
Overall100%67/10055/10063/100
02 — Side by side

Every spec in one table

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

Grok 4.3 vs Claude Opus 4.5 vs GPT-5.4 mini specifications side by side
SpecificationGrok 4.3xAIClaude Opus 4.5AnthropicGPT-5.4 miniOpenAI
Capability
Capabilities Index (ECI)149.2150.1 (best)148.8
ECI rank#55 of 148#48 of 148 (best)#56 of 148
GPQA DiamondGraduate-level science questions88.8% (best)86.1%86.9%
FrontierMath Tiers 1–3Research-level mathematics42.8%34.4%51.2% (best)
OTIS Mock AIME 2024–2025Competition mathematics93.3% (best)86.1%88.9%
SWE-bench VerifiedFixing real GitHub issues—76.7%—
SimpleQA VerifiedShort factual questions33.2%45.7% (best)29.4%
Price per million tokens
Input$1.25$5.00$0.75 (best)
Output$2.50 (best)$25.00$4.50
Cached input$0.20$0.50$0.075 (best)
Blended (3:1)$1.56 (best)$10.00$1.69
Long-context rateOver 200K: $2.50 / $5.00Same rateSame rate
Price sourceOfficial xAI APIOfficial Anthropic APIOfficial OpenAI API
Limits
Context window1,000,000 tokens (best)200,000 tokens400,000 tokens
Max output30,000 tokens64,000 tokens128,000 tokens (best)
Inputs and features
TextYesYesYes
ImagesYesYesYes
PDFsYesYesNo
AudioNoNoNo
VideoNoNoNo
ReasoningYeslow · medium · highYeslow · medium · highYeslow · medium · high · xhigh
Tool callingYesYesYes
Structured outputYesYesYes
Availability
WeightsProprietaryProprietaryProprietary
API model IDgrok-4.3claude-opus-4-5gpt-5.4-mini
API providers272829 (best)
ReleasedApr 17, 2026Nov 24, 2025Mar 17, 2026
Knowledge cutoff—May 2025Aug 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.

  • Grok 4.3$17.50
  • Claude Opus 4.5$100.00
  • GPT-5.4 mini$16.50
04 — Questions

Which should you choose?

Which is better: Grok 4.3, Claude Opus 4.5 or GPT-5.4 mini?

Grok 4.3 is the better all-round choice, scoring 67/100 against GPT-5.4 mini (63) and Claude Opus 4.5 (55). It leads on context window. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, Grok 4.3, Claude Opus 4.5 or GPT-5.4 mini?

Grok 4.3 is cheaper at $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); Claude Opus 4.5 costs $5.00 input / $25.00 output per million tokens (official Anthropic API price). At a typical mix of three input tokens to one output token, that is $1.56 per million tokens for Grok 4.3 versus $1.69 for GPT-5.4 mini (1.1× as much) and $10.00 for Claude Opus 4.5 (6.4× as much).

Which scores higher on benchmarks?

Claude Opus 4.5 scores higher on the Capabilities Index (ECI): Claude Opus 4.5 150.1 (#48 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 (147.9–153.0 vs 147.6–150.8), so treat the gap as small. On individual benchmarks: GPQA Diamond — Grok 4.3 88.8%, GPT-5.4 mini 86.9%, Claude Opus 4.5 86.1%; FrontierMath Tiers 1–3 — GPT-5.4 mini 51.2%, Grok 4.3 42.8%, Claude Opus 4.5 34.4%; OTIS Mock AIME 2024–2025 — Grok 4.3 93.3%, GPT-5.4 mini 88.9%, Claude Opus 4.5 86.1%; SimpleQA Verified — Claude Opus 4.5 45.7%, Grok 4.3 33.2%, GPT-5.4 mini 29.4%.

Which is better for coding?

There are no published SWE-bench Verified results for Grok 4.3 and GPT-5.4 mini yet, so there is no like-for-like coding score. On overall capability, Claude Opus 4.5 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?

Grok 4.3 has the largest context window at 1,000,000 tokens, against 400,000 for GPT-5.4 mini and 200,000 for Claude Opus 4.5. Maximum output per response: Grok 4.3 up to 30,000, Claude Opus 4.5 up to 64,000, GPT-5.4 mini up to 128,000 tokens.

Which can read images, PDFs, audio or video?

Grok 4.3 accepts text, images and PDFs; Claude Opus 4.5 accepts text, images and PDFs; GPT-5.4 mini accepts text and images. Grok 4.3 handles the widest range of inputs.

Are any of these open source?

No. Grok 4.3, Claude Opus 4.5 and GPT-5.4 mini are proprietary and only available through APIs and apps.

Which is newer?

Grok 4.3 is the newest, released Apr 17, 2026. GPT-5.4 mini came out Mar 17, 2026; Claude Opus 4.5 came out Nov 24, 2025. Knowledge cutoff: Claude Opus 4.5 May 2025, 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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