---
title: "Compare alternatives to GPT-6 Astra · Undominated.ai"
canonical: https://undominated.ai/alternatives/openai__gpt-6-astra/
description: "45 alternatives score at least as high as GPT-6 Astra and cost no more under at least one listed workload. 5 preserve recorded capabilities; 40 have named trade-offs."
---

# Compare alternatives to GPT-6 Astra · Undominated.ai

> 45 alternatives score at least as high as GPT-6 Astra and cost no more under at least one listed workload. 5 preserve recorded capabilities; 40 have named trade-offs.

# Alternatives to GPT-6 Astra

OpenAI · LMArena 1441.2 · $20.00/M on a balanced workload · prices as of 2026-11-05 , except 8 under confirmation

 [Compare models](https://undominated.ai/compare/) Comparison context

Choose up to three standard models in Compare.

Requirements and prompt length apply in Compare. This page keeps its stated price basis and workload controls.

## 5 models are higher-scoring or cheaper, with neither dimension worse.

Of the 141 models carrying both an independent score and a published price at the same delivery mode, **45** score at least as high as GPT-6 Astra and cost no more under at least one listed workload, with at least one of those dimensions improved. **44** of them cost less; the rest match the price and have a higher score. **5** match or beat its recorded context, maximum output, input modes, tool use and extended reasoning. **40** have a recorded capability loss, named on every row.

Dominance is not a property of a model. It is a property of a model, a capability lens and a workload, and all three are named on every row. Scores are LMArena Elo, used under CC BY 4.0 from the official dataset; prices are blended per million tokens. A higher score is not a drop-in replacement.

This page lists models only while a candidate improves score or price without worsening the other under a listed workload. When that comparison no longer holds, this address stays and says so.

## Where it holds

| Workload | GPT-6 Astra $/M | Recorded capabilities preserved | Recorded capability losses |
| --- | --- | --- | --- |
| Balanced | $20.00 | 5 | 40 |
| Summarise | $9.44 | 5 | 40 |
| Chat | $23.30 | 5 | 40 |
| Code gen | $33.28 | 5 | 40 |
| Agentic | $10.65 | 5 | 40 |

Workload mixes are defined on the [methodology page](/methodology/). Cached input is priced at the cached rate, and reasoning tokens at the worse of the reasoning and output rates.

## What you would be replacing

| Intelligence | 1441.2 |
| --- | --- |
| Context window | 1M |
| Max output | 128K |
| Input modes | file, image, text |
| Tool use | yes |
| Extended reasoning | yes |

Preserving recorded capabilities requires matching or beating these fields. [Full record for GPT-6 Astra](/models/openai__gpt-6-astra/), or [check GPT-6 Astra against the whole catalogue](/check/openai__gpt-6-astra/).

## Recorded capabilities preserved 5

Each option has a higher score or a lower price, with neither dimension worse under the listed workloads. It matches or beats GPT-6 Astra on recorded context, maximum output, input modes, tool use and extended reasoning.

| # | Model | Intelligence | $/M | Holds under |
| --- | --- | --- | --- | --- |
| 1 | [GPT-5.5](/models/openai__gpt-5.5/) OpenAI | 1466.8 +25.6 | $11.25 | Balanced −44% Summarise −47% Chat −41% Code gen −41% Agentic −43% |
| 2 | [GPT-5.6 Sol](/models/openai__gpt-5.6-sol/) OpenAI | 1457.2 +16 | $8.00 | Balanced −60% Summarise −60% Chat −60% Code gen −60% Agentic −60% |
| 3 | [GPT-5.4](/models/openai__gpt-5.4/) OpenAI | 1452.5 +11.3 | $5.63 | Balanced −72% Summarise −74% Chat −71% Code gen −70% Agentic −71% |
| 4 | [GPT-5.6 Terra](/models/openai__gpt-5.6-terra/) OpenAI | 1448.3 tie | $4.50 | Balanced −78% Summarise −79% Chat −77% Code gen −76% Agentic −77% |
| 5 | [GPT-6.1 Sol](/models/openai__gpt-6.1-sol/) OpenAI | 1445.6 tie | $4.00 | Balanced −80% Summarise −80% Chat −80% Code gen −80% Agentic −81% |

## Alternatives with recorded capability losses 40

These improve score or price without worsening the other under the listed workloads, but reduce at least one recorded capability. Read the last column before switching.

| Model | Intelligence | $/M | Holds under | Recorded capability loss |
| --- | --- | --- | --- | --- |
| [Gemini 4 Argon](/models/google__gemini-4-argon/) Google | 1528.6 +87.4 | $8.00 | Balanced −60% Summarise −61% Chat −60% Code gen −60% Agentic −61% | 1.1M → 1M context |
| [Claude Opus 5.5](/models/anthropic__claude-opus-5.5/) Anthropic | 1515.8 +74.6 | $8.00 | Balanced −60% Summarise −61% Chat −60% Code gen −60% Agentic −61% | 1.1M → 1M context |
| [Claude Fable 5.1](/models/anthropic__claude-fable-5.1/) Anthropic | 1513.8 +72.6 | $20.00 | Balanced same price Summarise −2% Chat −1% Code gen under 1% less Agentic −4% | 1.1M → 1M context |
| [Claude Opus 5](/models/anthropic__claude-opus-5/) Anthropic | 1504.1 +62.9 | $10.00 | Balanced −50% Summarise −50% Chat −50% Code gen −50% Agentic −50% | 1.1M → 1M context |
| [Gemini 3.8 Flash](/models/google__gemini-3.8-flash/) Google | 1498.5 +57.3 | $3.00 | Balanced −85% Summarise −85% Chat −85% Code gen −85% Agentic −85% | 1.1M → 1M context 128K → 66K max output |
| [Claude Opus 4.6](/models/anthropic__claude-opus-4.6/) Anthropic | 1501.7 +60.5 | $10.00 | Balanced −50% Summarise −50% Chat −50% Code gen −50% Agentic −50% | 1.1M → 1M context |
| [Muse Wonder](/models/meta__muse-wonder/) Meta | 1499.2 +58 | $8.00 | Balanced −60% Summarise −61% Chat −60% Code gen −60% Agentic −61% | 1.1M → 1M context |
| [MiMo-V2.6-Pro](/models/xiaomi__mimo-v2.6-pro/) Xiaomi | 1491.4 +50.2 | $0.540 Price under confirmation since Nov 5, 2026 | Balanced −97% Summarise −96% Chat −98% Code gen −98% Agentic −98% | no file input |
| [Muse Spark 1.3](/models/meta__muse-spark-1.3/) Meta | 1490.6 +49.4 | $2.00 | Balanced −90% Summarise −88% Chat −91% Code gen −91% Agentic −90% | 1.1M → 1M context |
| [Gemini 3.7 Flash](/models/google__gemini-3.7-flash/) Google | 1489.1 +47.9 | $3.00 | Balanced −85% Summarise −85% Chat −85% Code gen −85% Agentic −85% | 1.1M → 1M context 128K → 66K max output |
| [Claude Opus 4.7](/models/anthropic__claude-opus-4.7/) Anthropic | 1489.7 +48.5 | $10.00 | Balanced −50% Summarise −50% Chat −50% Code gen −50% Agentic −50% | 1.1M → 1M context |
| [Muse Spark 1.2](/models/meta__muse-spark-1.2/) Meta | 1482.7 +41.5 | $2.00 | Balanced −90% Summarise −88% Chat −91% Code gen −91% Agentic −90% | 1.1M → 1M context |
| [Claude Fable 5](/models/anthropic__claude-fable-5/) Anthropic | 1491.6 +50.4 | $20.00 | Balanced same price Summarise same price Chat same price Code gen same price Agentic same price | 1.1M → 1M context |
| [Gemini 3.6 Flash](/models/google__gemini-3.6-flash/) Google | 1479.8 +38.6 | $1.50 | Balanced −93% Summarise −93% Chat −93% Code gen −93% Agentic −93% | 1.1M → 1M context 128K → 66K max output |
| [Gemini 3.1 Pro Preview](/models/google__gemini-3.1-pro-preview/) Google | 1480.1 +38.9 | $4.50 | Balanced −78% Summarise −79% Chat −77% Code gen −76% Agentic −77% | 1.1M → 1M context 128K → 66K max output |
| [Muse Spark 1.1](/models/meta__muse-spark-1.1/) Meta | 1478.3 +37.1 | $2.00 | Balanced −90% Summarise −88% Chat −91% Code gen −91% Agentic −90% | 1.1M → 1M context |
| [Gemini 3.5 Flash](/models/google__gemini-3.5-flash/) Google | 1478.2 +37 | $3.38 | Balanced −83% Summarise −84% Chat −82% Code gen −82% Agentic −83% | 1.1M → 1M context 128K → 66K max output |
| [Kimi K3](/models/moonshotai__kimi-k3/) Moonshot AI | 1475.7 +34.5 | $3.96 Price under confirmation since Nov 4, 2026 | Balanced −80% Summarise −84% Chat −77% Code gen −77% Agentic −78% | 1.1M → 1M context no file input |
| [GLM 5.3](/models/z-ai__glm-5.3/) Z.ai | 1473.8 +32.6 | $0.409 Price under confirmation since Nov 4, 2026 | Balanced −98% Summarise −98% Chat −97% Code gen −97% Agentic −97% | 1.1M → 1M context no file, image input |
| [GLM 5.3 Flash](/models/z-ai__glm-5.3-flash/) Z.ai | 1473 +31.8 | $0.102 Price under confirmation since Nov 5, 2026 | Balanced −99% Summarise −99% Chat −99% Code gen −99% Agentic −99% | 1.1M → 1M context no file input |
| [Claude Sonnet 5.5](/models/anthropic__claude-sonnet-5.5/) Anthropic | 1472.9 +31.7 | $4.00 | Balanced −80% Summarise −80% Chat −80% Code gen −80% Agentic −81% | 1.1M → 1M context |
| [GLM 5.2](/models/z-ai__glm-5.2/) Z.ai | 1469.6 +28.4 | $0.409 Price under confirmation since Nov 4, 2026 | Balanced −98% Summarise −98% Chat −97% Code gen −97% Agentic −97% | 1.1M → 1M context no file, image input |
| [DeepSeek V4.1 Flash](/models/deepseek__deepseek-v4.1-flash/) DeepSeek | 1464.5 +23.3 | $0.096 Price under confirmation since Nov 5, 2026 | Balanced over 99% less Summarise over 99% less Chat −99% Code gen −99% Agentic −99% | 1.1M → 1M context no file input |
| [MiMo-V2.5-Pro](/models/xiaomi__mimo-v2.5-pro/) Xiaomi | 1464.2 +23 | $0.810 Price under confirmation since Nov 5, 2026 262K context at this price; 1M published | Balanced −96% Summarise −95% Chat −96% Code gen −96% Agentic −96% | 1.1M → 262K context at this price no file, image input |
| [GLM 5.1](/models/z-ai__glm-5.1/) Z.ai | 1462.8 +21.6 | $1.40 | Balanced −93% Summarise −92% Chat −94% Code gen −94% Agentic −93% | 1.1M → 205K context no file, image input |
| [Claude Opus 4.8](/models/anthropic__claude-opus-4.8/) Anthropic | 1461.3 +20.1 | $10.00 | Balanced −50% Summarise −50% Chat −50% Code gen −50% Agentic −50% | 1.1M → 1M context |
| [Gemini 2.5 Pro](/models/google__gemini-2.5-pro/) Google | 1457.7 +16.5 | $3.44 | Balanced −83% Summarise −86% Chat −81% Code gen −81% Agentic −82% | 1.1M → 1M context 128K → 66K max output |
| [Kimi K2.6](/models/moonshotai__kimi-k2.6/) Moonshot AI | 1455.6 +14.4 | $1.40 | Balanced −93% Summarise −92% Chat −93% Code gen −93% Agentic −91% | 1.1M → 262K context no file input |
| [Claude Sonnet 4.6](/models/anthropic__claude-sonnet-4.6/) Anthropic | 1457.7 +16.5 | $6.00 | Balanced −70% Summarise −70% Chat −70% Code gen −70% Agentic −70% | 1.1M → 1M context |
| [Qwen3.7 Plus](/models/qwen__qwen3.7-plus/) Qwen | 1454.6 +13.4 | $0.560 | Balanced −97% Summarise −97% Chat −97% Code gen −97% Agentic −97% | 1.1M → 1M context no file input |
| [MiMo-V2.6-Flash](/models/xiaomi__mimo-v2.6-flash/) Xiaomi | 1451.2 tie | $0.175 | Balanced −99% Summarise −99% Chat −99% Code gen −99% Agentic −99% | no file input |
| [Grok 4.5](/models/x-ai__grok-4.5/) xAI | 1447.6 tie | $3.00 | Balanced −85% Summarise −82% Chat −87% Code gen −87% Agentic −85% | 1.1M → 500K context |
| [Claude Opus 4.5](/models/anthropic__claude-opus-4.5/) Anthropic | 1450.9 tie | $10.00 | Balanced −50% Summarise −50% Chat −50% Code gen −50% Agentic −50% | 1.1M → 200K context 128K → 64K max output |
| [GLM 5](/models/z-ai__glm-5/) Z.ai | 1445.9 tie | $1.09 | Balanced −95% Summarise −93% Chat −95% Code gen −95% Agentic −94% | 1.1M → 205K context no file, image input |
| [DeepSeek V4 Pro 0423](/models/deepseek__deepseek-v4-pro/) DeepSeek | 1446 tie | $1.53 | Balanced −92% Summarise −91% Chat −93% Code gen −93% Agentic −92% | 1.1M → 1M context no file, image input |
| [Kimi K2.5](/models/moonshotai__kimi-k2.5/) Moonshot AI | 1444.9 tie | $1.20 | Balanced −94% Summarise −94% Chat −94% Code gen −94% Agentic −94% | 1.1M → 262K context no file input |
| [Gemma 4 31B](/models/google__gemma-4-31b-it/) Google | 1443 tie | $0.205 Price under confirmation since Nov 4, 2026 | Balanced −99% Summarise −98% Chat −99% Code gen −99% Agentic −98% | 1.1M → 262K context 128K → 16K max output no file input |
| [Step 5 Preview](/models/stepfun__step-5-preview/) StepFun | 1442.7 tie | $1.43 | Balanced −93% Summarise −91% Chat −94% Code gen −94% Agentic −93% | 1.1M → 1M context 128K → 64K max output no file input |
| [Inkling](/models/thinkingmachines__inkling/) Thinking Machines | 1442.7 tie | $1.76 | Balanced −91% Summarise −90% Chat −92% Code gen −92% Agentic −91% | 1.1M → 524K context no file input |
| [Claude Sonnet 5](/models/anthropic__claude-sonnet-5/) Anthropic | 1442.7 tie | $4.00 | Balanced −80% Summarise −80% Chat −80% Code gen −80% Agentic −80% | 1.1M → 1M context |

## What this compares, and what it leaves out

 - Quality is LMArena Elo, used under CC BY 4.0 from the official dataset. The 95% confidence interval on a difference between two scores is about ±10.21 points, so a gap smaller than that is marked *tie* rather than an improvement — see [significance bands](/significance/).
 - 197 further models at this delivery mode carry a price but no independent score. They are absent from the comparison in both directions — unrated is not a zero, and an unmeasured model is neither an alternative nor a worse buy.
 - Retired models are never offered as an alternative, and a model only competes against its own delivery mode: batch trades latency for price, so it is not a like-for-like swap.
 - Nothing here measures latency, throughput, rate limits or how a model behaves on your prompts. Two models with the same index score are not interchangeable.
 - Models with no higher-scoring or cheaper alternative that is no worse on the other axis are on the [value frontier](/frontier/). Models with such an alternative are [listed here](/alternatives/).

## Continue your investigation

 - [Check requirements](/check/)
- [Compare exact differences](/compare/)
- [Set a quality floor](/cheapest-at/)
- [Inspect tier boundaries](/cliffs/)