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AI Choice Engine

Model comparison

GPT-6 Sol vs Kimi K2.6

OpenAI against Moonshot AI, compared on context, price, and verified benchmark results.

Catalog record checked September 26, 2026Individual provider fields may changeEvidence confidence: High — see receipts below

OpenAI

GPT-6 Sol

Balanced

vs

Moonshot AI

Kimi K2.6

Balanced · Open weights

AI model capability comparison
SpecificationGPT-6 SolKimi K2.6
ProviderOpenAIMoonshot AI
TierBalancedBalanced
Context windowWinner: 1.05M262K
Max output128KNot verifiedUnverified
Input / 1M tokens$2Winner: $0.95
Output / 1M tokens$10Winner: $4
WeightsClosedOpen
ParametersGPT-6 mid-price tier1T total / 32B active (MoE, 384 experts)
Reasoning levelsnone, low, medium, high, xhigh, maxNot verifiedUnverified
Modalitiestext, imagetext, image, video
LicenseNot disclosedUnverifiedModified MIT
API model idgpt-6-solkimi-k2.6
ReleasedSeptember 22, 2026April 20, 2026
Artificial Analysis Intelligence Index [max] (2026-09-26)47.5Not verifiedUnverified
Artificial Analysis Intelligence Index (2026-09-26)Not verifiedUnverified27
DeepSWE 1.1 [max] (2026-09-22)68.8Not verifiedUnverified
OSWorld 2.0 (offline) [xhigh] (2026-09-22)60.5Not verifiedUnverified
Terminal-Bench 4.0 [max] (2026-09-26)43.9Not verifiedUnverified

Prices are USD per million tokens at standard rates, excluding batch and caching discounts. Bold indicates the better figure where one is objectively better. Values we could not confirm from the provider are shown as “Not verified” rather than estimated.

Benchmark receipts

Where each score comes from, and how far it can be compared across models.

  • 2026-09-26
    Artificial Analysis Terminal-Bench 4.0 (independent AA run, part of Intelligence Index v4.3.2)

    Agentic terminal work: long multi-step tasks executed in a sandboxed shell environment.

    Comparable with caveatNOT comparable with Terminal-Bench 2.x or 3.0 — 4.0 uses a new, non-overlapping task set. Within 4.0, scores from different harnesses (tbench.ai agent entries vs Artificial Analysis runs) are not interchangeable.

  • 2026-09-26
    Artificial Analysis

    Composite index blending reasoning, knowledge, and coding evals into one 0–100 score.

    Comparable with caveatOnly same-version scores are comparable. v4.3.2 was rebaselined (the top score fell from 66 on v4.1.1 to ~58), so v4.1.1 figures must not be compared with v4.3.2 figures — check measuredAt.

  • 2026-09-22
    OpenAI — Introducing GPT-6 Sol and Luna (vendor)

    Agentic software engineering: pass@1 on real repo tasks with reported cost per completed task.

    Directly comparable

Pricing tiers

GPT-6 Sol: Replaces GPT-5.6 Sol at 50% of its $4/$20 promo price. Cached input $0.20/MTok; cache writes $2.50 (1.25x). Above 272K input the whole request bills $4/$15 ($0.40 cached). Batch/Flex $1/$5; Fast mode $4/$20. Knowledge cutoff Apr 20 2026. Launched in the API, ChatGPT Work and Codex the same day.

Kimi K2.6: $0.95/$4.00 per MTok on the Moonshot API; cached input $0.16. No documented hard output cap; evals ran 98,304-token generations.

BalancedRecord checked September 26, 2026

GPT-6 Sol

GPT-6 Sol brings GPT-6 Astra's training advances to OpenAI's mid-priced tier — OpenAI claims roughly half GPT-5.6 Sol's factual-error rate at half its price, with a 1.05M-token context.

Best for

  • Default OpenAI production model
  • Agentic coding
  • Long-context knowledge work

Watch out

Brand-new (2026-09-22): the DeepSWE figure is vendor-reported and it is not yet on the independent boards; long prompts above 272K bill $4/$15 for the whole request.

BalancedOpen weightsRecord checked September 26, 2026

Kimi K2.6

Kimi K2.6 is Moonshot's open-weight volume workhorse — a 1T MoE with native image/video input at 256K context, the base Kimi K2.7-Code and K3 build on.

Best for

  • Open-weight volume work
  • Multimodal input on a budget
  • Self-hosting at mid size

Watch out

256K context is small next to K3's 1M; video input is experimental (official API only). No documented hard output cap.

When the cheaper one wins

Kimi K2.6 is cheaper on output at $4 per million tokens against $10 for GPT-6 Sol — about 2.5×. Use the cheaper tier for classification, extraction, summarisation, and any task where the expensive model’s extra score does not change the accepted output. The expensive one only pays if your hardest task actually fails on the cheap tier. These are standard-tier API rates, excluding batch and cache discounts.

Run the model picker

Evidence confidence: High

How strong and complete the evidence behind this comparison is — not a prediction of which model is better.

  • Pricing verified on both sides — Input and output rates are verified for both models.
  • 3/5 core specs verified on both sides — Not published for at least one side: max output, reasoning levels.
  • 1 shared named benchmark with differing scores — Measured on: Artificial Analysis Intelligence Index.
  • Verified within the last 90 days — Newest catalog check was 2 days ago.
  • Both models carry source citations — Each side has at least two catalog sources on record.

Source receipts

Each catalog figure was checked against the provider or an independent second source on the date shown.

Related comparisons

Diving deeper on one model? GPT-6 Sol · Kimi K2.6

Common questions

GPT-6 Sol vs Kimi K2.6

Answered from the verified figures on this page rather than general guidance.

Is GPT-6 Sol or Kimi K2.6 cheaper for input?
Kimi K2.6 is cheaper at $0.95 per million input tokens, against $2 for GPT-6 Sol — roughly 2.1× the price. Output tokens usually dominate a real bill, so weigh the output rate more heavily than the input rate. These are base rates; GPT-6 Sol has tiered pricing: Replaces GPT-5.6 Sol at 50% of its $4/$20 promo price. Cached input $0.20/MTok; cache writes $2.50 (1.25x). Above 272K input the whole request bills $4/$15 ($0.40 cached). Batch/Flex $1/$5; Fast mode $4/$20. Knowledge cutoff Apr 20 2026. Launched in the API, ChatGPT Work and Codex the same day. Kimi K2.6 has tiered pricing: $0.95/$4.00 per MTok on the Moonshot API; cached input $0.16. No documented hard output cap; evals ran 98,304-token generations.
Is GPT-6 Sol or Kimi K2.6 cheaper for output?
Kimi K2.6 is cheaper at $4 per million output tokens, against $10 for GPT-6 Sol — roughly 2.5× the price. Output tokens usually dominate a real bill, so weigh the output rate more heavily than the input rate. These are base rates; GPT-6 Sol has tiered pricing: Replaces GPT-5.6 Sol at 50% of its $4/$20 promo price. Cached input $0.20/MTok; cache writes $2.50 (1.25x). Above 272K input the whole request bills $4/$15 ($0.40 cached). Batch/Flex $1/$5; Fast mode $4/$20. Knowledge cutoff Apr 20 2026. Launched in the API, ChatGPT Work and Codex the same day. Kimi K2.6 has tiered pricing: $0.95/$4.00 per MTok on the Moonshot API; cached input $0.16. No documented hard output cap; evals ran 98,304-token generations.
Which has the larger context window, GPT-6 Sol or Kimi K2.6?
GPT-6 Sol accepts 1.05M tokens against 262K for Kimi K2.6. This only matters if you routinely send very long documents or large codebases.
Should I use GPT-6 Sol or Kimi K2.6?
Both sit in the balanced tier, so the choice usually comes down to price and context rather than capability. GPT-6 Sol suits default openai production model; Kimi K2.6 suits open-weight volume work.
Can I self-host GPT-6 Sol or Kimi K2.6?
Kimi K2.6 publishes open weights, but self-hosting and third-party provider access depend on the licence, hardware, serving support, and availability. GPT-6 Sol is a closed model whose supported access paths are controlled by its provider.

Next step

Choosing between them

The verified figures that separate this pair, computed from the catalog rather than restated boilerplate.

  • Input price: Kimi K2.6 costs $0.95 per 1M tokens versus $2 for GPT-6 Sol — a 2.1x difference at the headline tier.
  • Context: GPT-6 Sol takes 1.05M against 262K for Kimi K2.6 — only decisive if your prompts approach the smaller window.
  • Measured capability: GPT-6 Sol leads Artificial Analysis Intelligence Index 47.5 to 27 (measured 2026-09-26).
  • Deployment: Kimi K2.6 publishes weights you can self-host; the other is API-only.
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