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Home / Compare / AI models / GPT-6.1 Sol vs GPT-6.1 Terra

GPT-6.1 Sol vs GPT-6.1 Terra

Official OpenAI API prices and LMArena scores, checked 2026-10-29. Add up to 2 more models to compare 4.

Verdict

GPT-6.1 Terra costs less; GPT-6.1 Sol wins more LMArena tasks.

GPT-6.1 Terra is 2x cheaper on input and output. GPT-6.1 Sol scores 29 points higher for coding. Across 1 shared LMArena task, GPT-6.1 Sol leads 1 to 0. A medium month (20M input + 5M output tokens) costs $90 on GPT-6.1 Sol and $45 on GPT-6.1 Terra.

  • Pick GPT-6.1 Sol if you care most about coding (+29).
  • Pick GPT-6.1 Terra if you want the lower bill ($45 vs $90 for a medium month) or you reuse long prompts (cached input $0.05 vs $0.10).
Sample month

Medium: 20M input + 5M output tokens a month at list price (short-context rate, no caching or batch discounts).

GPT-6.1 SolvsGPT-6.1 Terra
Price per 1M tokens
Input$2$1 (better)
Cached input$0.10$0.05 (better)
Output$10$5 (better)
Sample month, medium$90$45 (better)
Context
Context window1.05M1.05M
Quality (LMArena relative score, out of 100)
Coding78 (better)49
Chat26n/a
Creative writing11n/a
Roleplay and characters4n/a
Reasoning and math59n/a
Vision85n/a
Long documentsn/an/a
Cheap bulk and agents78n/a

Marked side is better: lower for prices, higher for context and scores. Bars are scaled to the larger of the two.

Spec
GPT-6.1 Sol
GPT-6.1 Terra
Price per 1M tokens
Input$2$1
Cached input$0.10$0.05
Output$10$5
Blend 3:1$4$2
Sample month, medium$90$45
Context
Context window1.05M tokens1.05M tokens
Quality (LMArena, out of 100)
Coding78/100 #4 of 5049/100 #11 of 50
Chat26/100 #13 of 51Not ranked
Creative writing11/100 #14 of 51Not ranked
Roleplay and characters4/100 #14 of 51Not ranked
Reasoning and math59/100 #6 of 51Not ranked
Vision85/100 #2 of 33Not ranked
Long documentsNot rankedNot ranked
Cheap bulk and agents78/100 #5 of 34Not ranked
Details
ProviderOpenAIOpenAI
API model idgpt-6.1-solgpt-6.1-terra
NotesPrompts up to 272K. Longer prompts cost $4 in, $15 out.New Oct 26, 2026. Prompts up to 272K. Longer prompts cost $2 in, $7.50 out.
Sources
Last checked2026-10-292026-10-29
Official pricingOpenAI pricingOpenAI pricing

API prices in USD per 1M tokens from each provider's official pricing page. Blend 3:1 = (3 x input + output) / 4. Sample month = stated input and output tokens at the list price, no caching. Quality: relative score out of 100 on each LMArena leaderboard (100 = top model we price on that board, n/a = not ranked there), data licensed CC BY 4.0. See how we pick.

Where each one ranks on LMArena

Relative score out of 100 on each leaderboard (100 = the top model we price there), with the rank among the models from our API price table that appear on that board.

  • Coding (Code Arena): GPT-6.1 Sol #4 of 50 (78/100), GPT-6.1 Terra #11 of 50 (49/100)
  • Chat (Text Arena): GPT-6.1 Sol #13 of 51 (26/100), GPT-6.1 Terra not ranked
  • Creative writing (Text Arena creative writing): GPT-6.1 Sol #14 of 51 (11/100), GPT-6.1 Terra not ranked
  • Roleplay and characters (Text Arena multi-turn): GPT-6.1 Sol #14 of 51 (4/100), GPT-6.1 Terra not ranked
  • Reasoning and math (Text Arena math): GPT-6.1 Sol #6 of 51 (59/100), GPT-6.1 Terra not ranked
  • Vision (Vision Arena): GPT-6.1 Sol #2 of 33 (85/100), GPT-6.1 Terra not ranked
  • Long documents (Document Arena): GPT-6.1 Sol not ranked, GPT-6.1 Terra not ranked
  • Cheap bulk and agents (Agent Arena): GPT-6.1 Sol #5 of 34 (78/100), GPT-6.1 Terra not ranked

Pricing details from the official pages

GPT-6.1 Sol lists $2 input, $10 output, $0.10 cached input per 1M tokens on OpenAI pricing. GPT-6.1 Terra lists $1 input, $5 output, $0.05 cached input per 1M tokens on OpenAI pricing. Prices checked 2026-10-29.

  • GPT-6.1 Sol: Prompts up to 272K. Longer prompts cost $4 in, $15 out.
  • GPT-6.1 Terra: New Oct 26, 2026. Prompts up to 272K. Longer prompts cost $2 in, $7.50 out.

Sample monthly bill at list price, no caching: Light (2M input + 0.5M output tokens): $9 vs $4.50. Medium (20M input + 5M output tokens): $90 vs $45. Heavy (200M input + 50M output tokens): $900 vs $450.

FAQ

Is GPT-6.1 Sol cheaper than GPT-6.1 Terra?

GPT-6.1 Sol costs $2 input and $10 output per 1M tokens; GPT-6.1 Terra costs $1 and $5. For a medium month (20M input + 5M output tokens) GPT-6.1 Terra is cheaper: $45 vs $90.

Which is better for coding, GPT-6.1 Sol or GPT-6.1 Terra?

On LMArena's Code Arena GPT-6.1 Sol scores 78/100 (#4 of 50) and GPT-6.1 Terra 49/100 (#11 of 50), so GPT-6.1 Sol is ahead by 29 points.

Which has the bigger context window?

GPT-6.1 Sol: 1.05M tokens. GPT-6.1 Terra: 1.05M tokens. Both list the same window. Long prompts can cost more; see the pricing notes above.

How much do GPT-6.1 Sol and GPT-6.1 Terra cost per month?

Light (2M input + 0.5M output tokens): $9 vs $4.50. Medium (20M input + 5M output tokens): $90 vs $45. Heavy (200M input + 50M output tokens): $900 vs $450. Pick your own token counts in the plan vs API calculator.

Where do these numbers come from?

Prices come from each provider's official pricing page, checked daily. Quality is the relative score on the LMArena leaderboard dataset, licensed CC BY 4.0. Where a model is not ranked we show n/a.

Sources

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