ZMIME
Comparison · 2 models · Updated Nov 2, 2026

Claude Haiku 5.5 vs GPT-6.1 Sol

Claude Haiku 5.5 comes out ahead, 83 to 72 on our weighted score, and it is the cheaper option too.

  1. Our pick

    Anthropic

    Claude Haiku 5.5

    Released Oct 7, 2026New

    83/100
    • ECI160.4
    • Price$0.10 / $0.50
    • Context1M
    Full specs Remove Claude Haiku 5.5

  2. OpenAI

    GPT-6.1 Sol

    Released Sep 29, 2026New

    72/100
    • ECI167.8
    • Price$2.00 / $10.00
    • Context1.05M
    Full specs Remove GPT-6.1 Sol

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Claude Haiku 5.5 is our pick

Claude Haiku 5.5 is the better all-round choice, scoring 83/100 against GPT-6.1 Sol (72). It leads on price. GPT-6.1 Sol wins on capability. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityGPT-6.1 SolCapabilities Index (ECI): GPT-6.1 Sol 167.8 · Claude Haiku 5.5 160.4
  • Lowest priceClaude Haiku 5.5Claude Haiku 5.5 $0.20 · GPT-6.1 Sol $4.00 per 1M tokens (3:1 blend)
  • Longest contextGPT-6.1 SolGPT-6.1 Sol 1,050,000 · Claude Haiku 5.5 1,000,000 tokens
  • Widest inputsSame inputsClaude Haiku 5.5: Text, Images, PDFs · GPT-6.1 Sol: Text, Images, PDFs
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightClaude Haiku 5.5GPT-6.1 Sol
CapabilityCapabilities Index (ECI)50%8999
Price25%8020
Inputs & features15%8080
Context window10%6061
Overall100%83/10072/100
02 — Side by side

Every spec in one table

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

Claude Haiku 5.5 vs GPT-6.1 Sol specifications side by side
SpecificationClaude Haiku 5.5AnthropicGPT-6.1 SolOpenAI
Capability
Capabilities Index (ECI)160.4167.8 (best)
ECI rank#14 of 165#4 of 165 (best)
GPQA DiamondGraduate-level science questions89.7%95.4% (best)
FrontierMath Tiers 1–3Research-level mathematics75.1%93.7% (best)
OTIS Mock AIME 2024–2025Competition mathematics98.9%100% (best)
SimpleQA VerifiedShort factual questions23.8%73.9% (best)
Price per million tokens
Input$0.10 (best)$2.00
Output$0.50 (best)$10.00
Cached input$0.01 (best)$0.10
Blended (3:1)$0.20 (best)$4.00
Long-context rateOver 100K: $0.50 / $2.50Over 272K: $4.00 / $15.00
Price sourceOfficial Anthropic APIOfficial OpenAI API
Limits
Context window1,000,000 tokens1,050,000 tokens (best)
Max output128,000 tokens128,000 tokens
Inputs and features
TextYesYes
ImagesYesYes
PDFsYesYes
AudioNoNo
VideoNoNo
ReasoningYeslow · medium · high · xhigh · maxYeslow · medium · high · xhigh · max
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model IDclaude-haiku-5-5gpt-6.1-sol
API providers3333
ReleasedOct 7, 2026Sep 29, 2026
Knowledge cutoffJun 2026Apr 30, 2026
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.

  • Claude Haiku 5.5$2.00
  • GPT-6.1 Sol$40.00
04 — Questions

Which should you choose?

Which is better: Claude Haiku 5.5 or GPT-6.1 Sol?

Claude Haiku 5.5 is the better all-round choice, scoring 83/100 against GPT-6.1 Sol (72). It leads on price. GPT-6.1 Sol wins on capability. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, Claude Haiku 5.5 or GPT-6.1 Sol?

Claude Haiku 5.5 is cheaper at $0.10 input / $0.50 output per million tokens (official Anthropic API price). GPT-6.1 Sol costs $2.00 input / $10.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $0.20 per million tokens for Claude Haiku 5.5 versus $4.00 for GPT-6.1 Sol (20× as much).

Which scores higher on benchmarks?

GPT-6.1 Sol scores higher on the Capabilities Index (ECI): GPT-6.1 Sol 167.8 (#4 of 165) and Claude Haiku 5.5 160.4 (#14 of 165). Their confidence ranges do not overlap (164.3–172.5 vs 157.3–163.8), so the gap is a real one. On individual benchmarks: GPQA Diamond — GPT-6.1 Sol 95.4%, Claude Haiku 5.5 89.7%; FrontierMath Tiers 1–3 — GPT-6.1 Sol 93.7%, Claude Haiku 5.5 75.1%; OTIS Mock AIME 2024–2025 — GPT-6.1 Sol 100%, Claude Haiku 5.5 98.9%; SimpleQA Verified — GPT-6.1 Sol 73.9%, Claude Haiku 5.5 23.8%.

Which is better for coding?

There are no published SWE-bench Verified results for Claude Haiku 5.5 and GPT-6.1 Sol yet, so there is no like-for-like coding score. On overall capability, GPT-6.1 Sol leads, which tends to carry over to coding, but test on your own codebase. Both support tool calling for agent workflows.

Which has the bigger context window?

GPT-6.1 Sol has the largest context window at 1,050,000 tokens, against 1,000,000 for Claude Haiku 5.5. Maximum output per response: Claude Haiku 5.5 up to 128,000, GPT-6.1 Sol up to 128,000 tokens.

Which can read images, PDFs, audio or video?

Claude Haiku 5.5 accepts text, images and PDFs; GPT-6.1 Sol accepts text, images and PDFs. They handle the same number of input types.

Are any of these open source?

No. Claude Haiku 5.5 and GPT-6.1 Sol are proprietary and only available through APIs and apps.

Which is newer?

Claude Haiku 5.5 is the newest, released Oct 7, 2026. GPT-6.1 Sol came out Sep 29, 2026. Knowledge cutoff: Claude Haiku 5.5 Jun 2026, GPT-6.1 Sol Apr 30, 2026.

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 Nov 2, 2026.

05 — Keep comparing

Related comparisons